질문하기
Slice the beef thinly and season with salt and pepper.
Julienne the onion and bell pepper.
Heat olive oil in a pan and stir-fry the beef.
When the beef is cooked, add the vegetables and stir-fry together.
Slice the bread in half, toast it, and spread mustard sauce.
Place the grilled beef and vegetables on the bread to make a sandwich.
