
Simmer the rinsed lentils in 3 cups salted water for 20 minutes until tender, then drain.
While they cook, heat the oil in a large skillet over medium and cook the diced onion and pepper 6-7 minutes until soft.
Stir in the tomato sauce, ketchup, brown sugar, mustard, chili powder and 1/2 tsp salt.
Add the lentils and simmer 5-8 minutes, lightly mashing some lentils, until thick and saucy.
Spoon onto toasted buns. Check the bun label if you need them fully vegan; most plain supermarket buns are.
Photo: DinnerDrop