Hawaiian Sloppy Joes

2 tablespoons olive oil
1 onion, finely chopped
1 green bell pepper, finely chopped
8 ounces crimini mushrooms, trimmed and pulsed in a
food processor or finely chopped
2 cloves garlic, minced
1/2 teaspoon sea salt
1/4 teaspoon crushed red pepper
1 (15-ounce) can lentils, rinsed and drained (or 1 1/2 cups cooked lentils)
1 (14-ounce) can tomato sauce
1/4 cup soy sauce
1/4 cup packed brown sugar or maple syrup
1 tablespoon white or apple cider vinegar
1 cup chopped fresh pineapple
6 whole wheat buns

In a large pot, heat oil over medium-high heat and saute onions
and green peppers until soft. Add mushrooms and let cook,
stirring frequently, until soft, about 8 to 10 minutes. Add
garlic, salt, and crushed red pepper, and let cook a couple more
minutes.

Stir in lentils, tomato sauce, soy sauce, brown sugar, vinegar,
and pineapple. Reduce heat to medium. Simmer, uncovered, for 10
to 15 minutes, stirring occasionally. Remove from heat and
adjust seasoning to taste. Let it sit for at least 15 minutes
before serving on buns.