What type of lettuce is bitter?

Online Answer
Romaine lettuceRomaine lettuce The rib also gives this lettuce a slight bitter taste. This is the lettuce originally used when the Caesar salad was created.
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Contaminated romaine lettuce that made people sick in this outbreak harvested from the Salinas Valley growing region in California is no longer available for sale. CDC is no longer advising that people avoid romaine lettuce from this growing region.