Next is the perennial, burger-topping iceberg lettuce. You'll need 33 cups of ... But unlike real butter, this is crammed with folate, iron, and potassium. No Caesar salad is complete without ...

potassium, iron, folic acid, magnesium. Head lettuce refers to any lettuce that grows in a bunch, or a compact head. This group includes several very popular varieties, such as iceberg (or crisp ...

Low in calories, they provide potassium and vitamin A. Even pickled, this summer staple is a winner. Of all the varieties, ...