INGREDIENTS
4
portobello mushroom caps
2 tbsps
balsamic vinegar
1 tbsp
low sodium soy sauce
1 tbsp
olive oil
1 tbsp
rosemary
1 tsp
montreal steak seasoning
4 slices
red onion
4 ozs
reduced fat swiss cheese
4 slices
tomato
1/2
avocado
1 serving
baby spinach
4
sub buns