Next is the perennial, burger-topping iceberg lettuce. You'll need 33 cups of ... This pretty red and green leaf is chard. And it's a powerhouse. We're talking 300% of your daily vitamin K.

Romaine lettuce is an easy-to-grow crop that produces tall heads of dark green leaves and are very popular in a Caesar salad. Romaine is commonly seen in stores sold as whole heads, however ...

Romaine Lettuce: With elongated, dark green leaves and a slightly bitter taste, it's a staple in Caesar salads. Butterhead Lettuce: Its soft, buttery leaves have a mild flavor, making it a ...