Answer:

eggwhite

Answer	Crossword Clue
EGGWHITE	Meringue ingredient
EGGWHITE	Ramos gin fizz ingredient
EGGWHITE	Albumen

EGGWHITE	It's whipped to make mousse
EGGWHITE	Kind of omelet
EGGWHITE	Meringue requirement
EGGWHITE	Ingredient separated and whipped in meringue