Chopped lettuce
Chopped green onions (or any onion)
Chopped mango (green pepper)
Chopped olives
Chopped tomatoes
Grated Longhorn cheese (or Cheddar)
Hot ground beef (browned hamburger, crumbled and drained of grease)
More cheese
Doritos or Fritos (crushed)
Old El Paso taco sauce (mild or hot)

"Enjoy".