Vietnamese Hamburgers

1 lb lean ground beef
1 tablespoon fish sauce
1 tablespoon minced lemon grass
2 cloves garlic, minced
2 teaspoons red pepper flakes
1 slice cucumbers
1 cup fresh bean sprouts
iceberg lettuce
sweet chili sauce (optional; or sweet & sour)
nuoc cham sauce
4 kaiser rolls

1. Mix ground beef with fish sauce, lemon grass, garlic, and red pepper.
2. Form 4 patties out of beef, patting lightly.
3. Cook over hot coals (preferred), or cook in skillet or under broiler, turning once.
4. Serve on split kaiser rolls, with slices of cucumber, bean sprouts, and lettuce leaves.
5. For condiments, use sweet chilli sauce (tastes like a spicy hot sweet& sour).
6. You can also use extra nuoc cham and extra chile flakes.