Related Clues:

• Substance
• Meat
• Spam, e.g.
• Muscle
• Good source of protein
• Argument
• Burrito filler
• Muscular strength
• Cold cuts, e.g.
• Potatoes' partner
• Vegetarian's no-no
• Spam, ham or lamb
• Potatoes partner
• Beef, e.g.
• See 43-Across