preferred egg yolk derived emulsifiers in this invention are ( fresh ) egg yolk , stabilised egg yolk ( sey ), enzymatically treated egg yolk , dried egg yolk , salted egg yolk , or egg yolk treated in any other way as known in the art of egg yolk emulsifiers to yield egg - yolk derived emulsifiers , e . g . lecithin . when egg yolk is used in the compositions according to the invention , a suitable amount is 0 . 5 - 10 %, preferably 1 - 8 % ( wt ), more preferably 3 - 7 % ( wt ). when egg yolk - derived products are chosen ( e . g . dried egg yolk ) then the amount should be calculated on the basis of raw egg yolk . the presence of egg yolk is beneficial for both taste and emulsification of the oil droplets . although the composition according to the invention may be achieved with a wide variety of fat levels , it is preferred that the composition according to the invention comprises from about 40 - 65 % ( wt ) of oil , or even more preferred from about 45 - 60 % ( wt ) of oil . preferred oils are triglyceride oils of vegetable origin , such as sunflower , corn , olive , soy bean , palm , sesame , safflower or linseed oil . the casein utilised in the present invention is preferably added as skimmed milk powder ( smp ), containing 35 % protein of which about 28 % casein and 7 % whey protein . the amounts of casein employed in the compositions according to the invention are ( calculated as pure casein ) between 0 . 1 and 2 %, preferably 0 . 2 - 1 . 5 % by weight , based on the total composition . as the emulsions according to the invention are intended as a mayonnaise - like product , but with a lower amount of oil present , the emulsions according to the invention may further comprise ingredients which are commonly used in mayonnaise , such as acetic acid , citric acid , 0 . 1 - 7 % mustard , 0 . 5 - 2 % salt , pepper and sugar . as a result of any organic acid present , the ph of the water phase of the emulsion will usually be 3 . 0 - 5 . 0 . optionally , the compositions according to the invention may further comprise 0 . 02 - 0 . 4 % of natural gums , and / or sugars . the emulsions according to the invention may suitably be prepared by a process involving the following steps : mix all the ingredients except for the oil and the egg yolk derived emulsifier , homogenise , e . g . in a high pressure homogeniser at pressures of more than 50 bar , preferably at least 100 bar ( preferably less than 250 bar ), the invention is further illustrated by the following examples , which are to be understood as non - limiting . five formulations have been preferred according to the compositions as are set out in table 1 . disperse powders in cold water using turrax , add vinegar , lactic acid , pasteurise the water 75 ° c . for 2 min . in waterbath . cool water phase to ca 55 ° c . add sey , followed by oil ( 55 ° c . ), using stirrer . adjust the ph of this pre - emulsion to 3 . 9 with lactic acid . turrax for a few seconds . homogenise in colloid mill ( gronfa ) at 50 ° c . fill jars , allow to cool . disperse powders in cold water using turrax , add vinegar , lactic acid , pasteurise the water 75 ° c . for 2 min . in waterbath . cool water phase to ca 55 ° c . add sey , followed by oil ( 55 ° c . ), using stirrer . adjust the ph of this pre - emulsion to 3 . 9 with lactic acid . turrax for a few seconds . homogenise in high pressure homogeniser ( apv ) at 100 bar , at 50 ° c . fill jars , allow to cool . disperse powders in cold water using turrax , add vinegar , lactic acid , pasteurise the water 75 ° c . for 2 min . in waterbath . cool water phase to ca 20 ° c . add sey , followed by oil ( 20 ° c . ), using stirrer . adjust the ph of this pre - emulsion to 3 . 9 with lactic acid . turrax for a few seconds . homogenise in a high pressure homogenisator ( apv ) two times at 200 bar , at 50 ° c . fill jars , allow to cool . disperse powders in cold water using turrax , add vinegar , lactic acid , mustard , pasteurise the water 75 ° c . for 2 min . in waterbath . cool water phase to ca 20 ° c . add sey , followed by oil ( 20 ° c . ), using stirrer . adjust the ph of this pre - emulsion to 3 . 9 with lactic acid . turrax for a few seconds . homogenise in high pressure homogeniser ( apv ) at 100 bar at 20 ° c . fill jars . of the resulting products , stevens values have been measured ( which give an indication of the firmness / spoonability ). description measurement stevens value : the firmness of all products at 20 ° c . ( after storage at 20 ° c . for two weeks ) was measured using a stevens texture analyser ( 2 mm / sec , 20 mm depth , mayonnaise grid ( mesh 7 , thread thickness 0 . 8 mm , mesh width 2 . 83 mm , see fig1 ), and is quoted herein as the stevens value ( in g ). the accuracy of this measurement in all cases is ± 10 g .
edible oil - in - water emulsion comprising : 35 - 70 % edible oil 0 . 5 - 10 % egg yolk derived emulsifier 0 . 3 - 1 . 5 % casein 65 - 25 % water , wherein at least 60 % of the oil droplets has a size of 1 - 5 μm . such a composition preferably has a stevens value of 60 - 160 , when measured using a stevens texture analyser , at 20 ° c ., after 2 weeks storage at 20 ° c ., using a speed of 2 mm / s and a distance 20 mm .