INGREDIENTS
4
buns
4
round steaks
lettuce
1
large onion
7 oz
mushrooms
3 tbsp
soy sauce
1/2 tsp
fresh ginger
1/2
garlic clove
pepper and salt
2 tsp
brown sugar
1 tbsp
mirin
1/8
to 1/4 tsp sesame oil
salt and pepper
dried chili flakes (or cayenne pepper)
butter