Romaine "hearts" are a trimmed version of the familiar lettuce variety that grows in a tall head of sturdy dark green leaves with firm ribs down its center. Romaine “hearts” have had the outer leaves removed and are often packaged together.
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Refreshingly crisp as a base in everyday salads and sturdy enough to hold up to heat for grilling or sautéing—Romaine hearts are the definition of versatile. The long green leaves stay crunchy in a salad and stand up to dressing without quickly wilting.
The best way to store heads of lettuce is to remove any damaged or wilted outer leaves, then wrap in paper towels. Store in the crisper drawer of the refrigerator until ready to use.
According to the USDA, one cup of shredded Romaine lettuce has only 8 calories, making it an ideal low calorie food.