Vegan Sloppy Joes

Name: Vegan Sloppy Joes
Prep time: 5 min
Cook time: 30 min
Total time: 35 min
Cuisine: American
Ingredients: 1 cup red lentils (uncooked); 3 cups water; 1 tablespoon olive oil; 1 medium onion (chopped); 1 red bell pepper (chopped); 3 cloves garlic (minced); 2 tablespoons chile powder; 1 teaspoon smoked paprika; 2 teaspoons dried oregano; 1 teaspoon fine sea salt; 1 cup tomato sauce; 2 tablespoons tomato paste; 1 tablespoon maple syrup (optional); 2 teaspoons yellow mustard; 6 hamburger buns