Modifiers matching lettuce:

• bitter,
• mild,
• torn,
• crisp,
• small,
• hearty,
• new,
• fresh,
• clean,
• mixed,
• leafy,
• dark,

Simple categories matching hearty:

• food,
• dish,
• ingredient,
• fish,
• sandwich,
• seafood,
• meal,
• fare,
• vegetable,
• veg,
• seed,
• soup,
• meat,
• plant,
• lettuce,
• filling,
• pasta,
• green,
• grain,
• sausage,