In a bowl, mix ground beef, egg, onion, garlic, salt and Cameroon pepper until well blended. Divide mixture into four equal portions and shape each into a patty.

Heat up frying pan, lay burgers in the pan cook burgers, turning once, until browned on both sides and no longer pink inside (cut to test), 7 to 8 minutes total. Remove from pan.

Lay buns, cut side down, Spread mayonnaise and ketchup on bun bottoms. Add lettuce, tomato, burger, onion, and salt and pepper to taste. Set bun tops in place.

And Serve