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Season the chuck flap steak with salt and pepper.
Add olive oil to a pan and grill the chuck flap steak.
Slice onion and bell pepper thinly and sauté them in a pan.
Cut the whole wheat bread in half and toast it.
Spread mustard sauce on the bread.
Place the grilled chuck flap steak, vegetables, and romaine lettuce on the bread.
Top with the other slice of bread to complete the sandwich.
