Romaine lettuce, also known as cos lettuce, is a leafy vegetable in the daisy family that is closely related to celtuce and sword lettuce. The heart of the lettuce refers to the inner plant after the outer leaves have been removed. Romaine lettuce is crisp with a refreshing flavor that is mildly bitter with a slight sweetness. It is the lettuce of choice for the iconic Caesar salad.
Uses: Romaine, unlike other lettuces, is quite tolerant of heat. It is delicious lightly charred over a hot grill or cast iron pan.