INGREDIENTS
4
portabella mushroom caps
2 tbsp
balsamic vinegar
1 tbsp
olive oil
1 tbsp
Worcestershire sauce (vegan if needed)
1 tbsp
Italian seasoning
1 1/2 tsp
Montreal steak seasoning
1
red onion, sliced
4
slices low fat Swiss cheese (like Jarlsberg)
1
tomato, sliced
1
avocado, sliced
2 cups
arugula
4
reduced calorie hamburger buns