The thick heads are loosely connected to a central blanched base and the leaves, averaging 10-15 centimeters in length, are broad with many folds and creases. The outer leaves are dark green with a prominent white central rib, and as the leaves grow smaller in the center, they become paler in color almost fading to white. Romaine lettuce is crisp, succulent, and crunchy with a mild, slightly bitter taste.
Romaine Lettuce an excellent source of dietary fiber, vitamins A, C, and K, thiamin, folate, iron, potassium, and manganese. It is also a good source of riboflavin, vitamin B6, calcium, magnesium, phosphorus, and copper. Romaine lettuce is best suited for both raw and cooked applications such as braising, grilling, and lightly boiling. The leaves can be used fresh and torn for salads, or they can be used as a dipping vessel for sauces, dips, and fillings. They can also be layered on sandwiches, burgers, and in wraps for added crunch.