Uncooked 93% lean ground beef

1 pound(s)

Red onion

¼ cup(s), chopped

Teriyaki sauce

2 Tbsp

Table salt

¼ tsp

Black pepper

¼ tsp

Ketchup

½ cup(s)

Red pepper flakes

1 tsp, or sun-dried hot chile pepper, or to taste

Tomato

1 medium, cut into 8 slices

Romaine lettuce

1 oz, (approx.) 4 leaves