INGREDIENTS
2 tbsp
Vegetable oil, (divided)
8
to 10 ounces mushrooms ((white or cremini), diced)
1/2
white onion, (diced)
1
large carrot, (diced)
1
stalk celery, (diced)
1/2
green bell pepper, (diced)
3/4 cup
cooked lentils
1/2
to 3/4 cup ketchup
1 tsp
vegetarian Worcestershire sauce
1/2 tsp
mustard
sea salt and black pepper
4
whole wheat buns