Butter lettuce is a type of lettuce that includes Bibb lettuce and Boston lettuce. It's known for loose, round-shaped heads of tender, sweet leaves and a mild flavor. All varieties of butterhead lettuces have smooth, loosely-coiled leaves that are often sold with the roots still attached to preserve freshness.
This lettuce is a good source of carotenoid antioxidants, such as beta carotene, lutein, and zeaxanthin.
Fresh lettuce can be stored in the freezer for up to 6 months. This tip works best with sturdy-leafed greens, such as romaine and butterhead.