The thick ribs,
especially on the older outer leaves, should have a milky
fluid which gives the romaine the typically fine-bitter
herb taste. Romaine is the standard lettuce used in Caesar
Salad
Romaine lettuce is often
used in the Passover Seder as a type of bitter herb, to
symbolize the bitterness inflicted by the Egyptians whilst
the Israelites were slaves in Egypt.
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