Romaine lettuce is also commonly known as cos lettuce ... While most well-known for long green leaves, there are romaine varieties that stray from the norm you see in most stores.

While all types of lettuce are well-liked individually, mixed greens often combine more than one of these varieties along with mustard greens, endives, red and green oak leaf and little gem lettuce.

The green is liked because of its "slightly ... These are the young, tender leaves of various types of lettuce that are harvested before they reach full maturity. "They can be enjoyed in smoothies ...