On food and cooking the science and lore of the kitchen ( PDFDrive ) 724

andcommonlyprocessedintocanned
segments.
Pummelo Pummelos require the warmest
growing conditions of the common citrus
fruitsandhavebeenslowtospreadfromtheir
home in tropical Asia, where they were
cultivated in ancient times. They’re large, 10
in/25 cm or more in diameter, with a
relatively thick albedo layer; large, easily
separated juice vesicles that burst in the
mouth; thick and tough segment membranes;
and an absence of the bitterness that flavors
its offspring the grapefruit. Some varieties
havepink-redvesicles.
OrangeNearlythree-fourthsofallcitrusfruit
produced in the world are oranges, whose
juiciness and moderate size, sweetness, and
acidity make them especially versatile.
They’re probably an ancient hybrid between
the mandarin and the pummelo, and have in
turn been developed into several very


differentkindsoffruit.
Navelorangesprobablyoriginatedin
China,butbecameamajorcommodity
worldwidewhenaBrazilianvarietyarrivedin
theUnitedStatesin1870.Thenavel-like
appearanceoftheirblossomendiscausedby
thedevelopmentofasmallsecondarysetof
segments.Navelsaretheidealorangefor

eatingfreshbecausethey’reseedlessand
easilypeeled.However,thetreesarefinicky
togrow,andtheirjuicecontainsfewerfruity
estersthanthebestjuicevarieties.Andjuice
madefromnavelorangeswillbecome
noticeablybitterafterabout30minutes.This
happensbecausewhenthejuicecellsare
brokenandtheircontentsmixed,acidsand
enzymesconvertatastelessprecursor
moleculeintoanintenselybitterterpene
compoundcalledlimonin.
CitrusFamilyRelationships