Cook rice vermicelli according to package. Drain and rinse under cold water.

In a large nonstick pan, cook ground sirloin over medium-high heat until browned, about 5-6 minutes. Drain excess fat.

Add garlic and cook for 2 minutes.

Stir in noodles, carrots, cucumber, red pepper, onion and mint.

In a small bowl, combine lime juice, soy sauce and sugar until sugar dissolves.

Add juice mixture to beef and stir until beef is coated.

Serve beef mixture in lettuce leaf.