The term 'salad staple' refers to ingredients commonly used in salads. Two of the crossword solutions for this term are BROCCOLI (8 letters) and ENDIVE (6 letters). BROCCOLI is a green vegetable that belongs to the cabbage family and is known for its high nutritional value. ENDIVE is a leafy vegetable with a slightly bitter taste. The third solution is TOMATO (6 letters), which is a red, juicy fruit that is widely used in salads. All three of these ingredients are popular salad staples.