Ruby & Webb are 2 varieties of this citrus fruit
[DOC] [TLE] GRAPEFRUIT [PAR] Pummelos, the largest of the citrus fruit varieties, are also called Chinese ... One 
medium grapefruit will give you 2/3 of a cup of fresh-squeezed ... -pulped 
varieties are Duncan and Marsh; the major pink-pulped varieties are Ruby and 
Webb.