while this invention is susceptible of embodiment in many different forms , there is shown in the drawings and described in detail herein , several specific embodiments with the understanding that the present disclosure is to be considered as exemplifications of the principles of the invention and is not intended to limit the invention to the embodiments illustrated . u . s . pat . nos . 5 , 590 , 586 , 5 , 724 , 886 , 5 , 947 , 012 , 6 , 119 , 587 , 6 , 209 , 447 , 6 , 358 , 548 and 6 , 607 , 766 are hereby expressly incorporated by reference . referring to the figures generally , and in particular to fig1 , a tray insert 10 according to the present invention is shown generally as having a tray insert body 12 . tray body 12 comprises a supporting surface 14 and a plurality of insert supports 16 a - d . insert supports 16 a - d give tray insert 10 height . supporting surface 14 is a generally flat surface . supporting surface 14 further comprises a plurality of apertures 18 to form a generally circular shape generally corresponding to the size of cooked food portions to be stored thereon . apertures 18 can be any shape , size , or number as appropriate for the cooked food that will be stored on supporting surface 14 . typically , apertures 18 define a total void space opening of at least 30 %. more typically , apertures 18 define a total void space opening of at least 50 %. referring to the figures generally , and in particular to fig2 , a tray insert 30 according to the present invention is shown generally as having a tray insert body 32 . tray body 32 comprises a supporting surface 34 and a plurality of insert supports 36 a - d . insert supports 36 a - d give tray insert 30 height . supporting surface 34 is a generally flat surface that would support a cooked food portion . tray body 32 may further comprise at least one finger opening 38 a - b . finger openings 38 a - b allow for tray insert 30 to be easily placed into or removed from a food tray . finger openings 38 a - b can be any shape to allow a finger and / or thumb to easily grip tray insert 30 . typically , finger openings 38 a - b are semi - circular in shape . referring in particular to fig3 and fig4 , a food tray 40 is provided according to the present invention and is shown generally as having a tray bottom lower surface 42 . food tray 40 further comprises a sidewall structure 44 . sidewall structure 44 and tray bottom lower surface 42 define a tray volume 46 . tray insert 10 or 30 can be inserted into food tray 40 . hamburger patties h and h 2 sit on top of supporting surfaces 14 and 34 , respectively . referring in particular to fig5 , a food tray 60 is provided according to the present invention and is shown generally as having a lower surface 62 . food tray 60 further comprises a sidewall structure 64 . sidewall structure 64 and lower surface 62 define a tray volume 66 . food tray 60 further comprises a tray insert 68 , inserted into food tray 60 . tray insert 68 comprises a supporting surface 70 and insert supports 72 a - d . any number of insert supports can be present as necessary to support tray insert 68 . typically , insert supports 72 a - d prevent tray insert 68 from sagging in the middle , keeping supporting surface 70 essentially generally straight . supporting surface 70 and lower surface 62 define a lower volume 73 . lower volume 73 can be any percentage of tray volume 66 as desired , from about 0 % to about 90 %. typically , lower volume 73 is approximately 50 % of the overall tray volume . tray insert 68 further comprises a plurality of apertures 74 . any number of apertures as desired may be on tray insert 68 . the plurality of apertures may be any potential , suitable shape , such as , for example , ovals , circles , slits , or rectangles . typically , the apertures are arranged in a generally circular shape , such that hamburger patties essentially cover the apertures . typically , the apertures are arranged to form a generally circular shape approximately the size of a hamburger patty . typically , the apertures will be essentially completely covered by at least one hamburger patty . tray insert 68 further comprises a plurality of hamburger patties h located on supporting surface 70 and essentially completely covering apertures 74 . referring in particular to fig6 , a food tray 80 is provided according to the present invention and is shown generally as having a lower surface 82 . food tray 80 further comprises a sidewall structure 84 . sidewall structure 84 and lower surface 82 define a tray volume 86 . food tray 80 further comprises a tray insert 88 , inserted into food tray 80 . tray insert 88 comprises a supporting surface 90 and insert supports 92 a - d . any number of insert supports can be present as necessary to support tray insert 88 . typically , insert supports 92 a - d prevent tray insert 88 from sagging in the middle , keeping supporting surface 90 essentially generally straight . supporting surface 90 and lower surface 82 define a lower volume 93 . lower volume 93 can be any percentage of tray volume 86 as desired , typically , for example , from about 0 % to about 90 % of the overall tray volume . typically , lower volume 93 is approximately 50 % of the overall tray volume . tray insert 88 further comprises finger grips 94 a - b on opposite ends of tray insert 88 . finger grips 94 a - b allow tray insert 88 to be easily removed from or inserted into food tray 80 . finger grips 94 a - b can be any size and shape to facilitate a typical human finger . typically , the finger grips are semi - circular in shape , as shown in finger grips 94 a - b . tray insert 88 further comprises a plurality of hamburger patties h 2 located on supporting surface 90 . referring in particular to fig7 , a food tray 100 is provided according to the present invention and is shown generally as having a lower surface 102 and supporting sidewalls 104 . lower surface 102 and supporting sidewalls 104 define a tray volume 106 . food tray 100 further comprises an integral tray insert 108 . tray insert 108 is an integral part of food tray 100 and is not removable from food tray 100 . tray insert 108 comprises a supporting surface 108 ′. supporting surface 108 ′ of tray insert 108 and lower surface 102 of tray 100 together define a lower volume 110 . lower volume 110 can be any percentage of tray volume 106 as desired , typically , for example , from about 0 % to about 90 % of the overall tray volume . typically , lower volume 110 is approximately 50 % of the overall tray volume . lower volume 110 allows supporting surface 108 ′ of tray insert 108 to be elevated above lower surface 102 , such that any food portions placed upon supporting surface 108 will not be directly adjacent any heat source contacting lower surface 102 . by defining lower volume 110 and not directly contacting any food portions placed on supporting surface 108 with the heated lower surface 102 , the food portions can be stored in food tray 100 for extended periods of time . referring to fig8 , a tray insert 109 according to the present invention is shown generally as having a tray insert body 111 . tray body 111 comprises a supporting surface 112 and a plurality of insert supports 114 a - d . insert supports 114 a - d give tray insert 109 height . supporting surface 112 is an essentially generally flat surface . supporting surface 112 further comprises a plurality of apertures 116 to form a generally circular shape generally corresponding to the diameter or footprint of cooked food portions to be stored thereon . apertures 116 are generally circular in shape as appropriate for the cooked food that will be stored on supporting surface 112 and form an overall generally circular shape approximately the size and shape of a hamburger patty . typically , apertures 116 define a total void space opening of at least 30 %. more typically , apertures 116 define a total void space opening of at least 50 %. referring to fig9 , a tray insert 120 according to the present invention is shown generally as having a tray insert body 121 . tray body 121 comprises a supporting surface 122 and a plurality of insert supports 124 a - d . insert supports 124 a - d give tray insert 120 height . supporting surface 122 is an essentially generally flat surface . supporting surface 122 further comprises a plurality of apertures 126 to form a generally circular shape generally corresponding to the size of the cooked food portions to be stored thereon . apertures 126 are generally triangular in shape as appropriate for the cooked food that will be stored on supporting surface 122 and form an overall generally circular shape approximately the size and shape of a hamburger patty . typically , apertures 126 define a total void space opening of at least 30 %. more typically , apertures 126 define a total void space opening of at least 50 %. referring to fig1 , a tray body 180 is provided . tray body 180 comprises a tray bottom lower surface 182 and supporting sidewalls 183 . lower surface 182 and supporting sidewalls 183 define a tray volume 184 . tray body 180 further comprises finger grips 186 a - b . individual food portions 188 a - f are contained within food tray 180 , located on lower surface 182 . tray body 180 has an overall height x . individual food portions have a food portion height y . food portion height y can be any height equal to or less than overall height x . typically , food portion height y is one half of overall height x . referring to fig1 , a tray body 200 is provided . tray body 200 comprises supporting sidewalls 202 , a lower surface 203 , and tray legs 204 . lower surface 203 and tray legs 204 further define a lower volume 205 . tray body 200 further comprises finger grips 206 a - b . lower surface 203 and supporting sidewalls 202 further define a tray volume 208 . individual food portions 210 a - f are located on lower surface 203 within tray volume 208 . tray body 200 is resting on a lower compartment surface 212 . lower volume 205 is further bound and defined by lower compartment surface 212 . lower volume 205 has a supporting surface height z . height z can be any suitable height to prevent direct contact of lower surface 203 with lower compartment surface 212 . referring to fig1 , a method of storing individual portions of food is provided . a universal holding cabinet 130 is provided to store individual portions of food . a food tray 132 is provided . food tray 132 comprises a tray insert 134 that is elevated above the lower surface of food tray 132 . tray insert 134 comprises a supporting surface 136 and finger grips 138 . supporting surface 136 allows for the storage and placement of individual portions of food h 2 . individual portions of food h 2 are placed on supporting surface 136 . food tray 132 is inserted into one of heated compartments 142 a - c in universal holding cabinet 130 . heated compartments 142 a - c comprise a heated lower compartment surface 144 . food tray 132 is stored in one of heated compartments 142 a - c for a period of time , maintaining the temperature of the cooked food products in a desired elevated storage temperature range . referring to fig1 , a method of storing previously cooked hamburger patties after cooking and before incorporation into a hamburger sandwich is provided . a universal holding cabinet 150 is provided to store individual portions of food . food trays 152 a - d are provided . universal holding cabinet 150 is a pass - through design , allowing food trays 152 a - d to be inserted into and removed from either side of universal holding cabinet 150 . food trays 152 a - d further comprise supporting surface 154 . individual hamburger patties h are placed upon supporting surface 154 and inside food tray 152 b . referring to fig1 , a method of making a hamburger sandwich is provided . food tray 80 is provided which comprises tray volume 86 and tray insert 88 . tray insert 88 further comprises supporting surface 90 and finger grips 94 a - b . hamburger patties h 2 are supported upon supporting surface 90 . hamburger patty h 2 is on spatula s and is removed from food tray 80 . preparation of the hamburger sandwich occurs in work space 160 . the hamburger patties h 2 are assembled into hamburger sandwiches by applying condiments c and a bottom bun bb and a bun cap bc . bottom bun bb , bun cap bc , condiments c , and hamburger patty h 2 are placed together to prepare a hamburger sandwich . while the invention has been described with respect to certain preferred embodiments , as will be appreciated by those skilled in the art , it is to be understood that the invention is capable of numerous changes , modifications and rearrangements , and such changes , modifications and rearrangements are intended to be covered by the following claims .
a food tray and tray insert are provided that are particularly adapted for use in a heated food holding compartment . methods of storing cooked food are also provided using such devices . the devices and use thereof allows cooked food such as hamburger patties to be stored at elevated temperatures for extended periods of time without a significant deleterious effect on the organoleptic properties of the cooked food .