Related Clues:

• Butterhead, e.g.
• Pungent greens
• Salad ingredient, perhaps
• Mustard family plant
• Mouth burner
• Pickle, once
• Germany's V-2, e.g.
• Iceberg is one type
• Tossed salad ingredient
• Tuna salad ingredient
• Salad-bar item
• Salad ingredient, sometimes
• Sticks in the supermarket
• Leaf source
• Salad vegetable, perhaps