Vegan Lentil Sloppy Joes

Ingredients

• 1 large sweet onion, roughly chopped
• 1 medium green bell pepper, roughly chopped
• 1 medium red bell pepper, roughly chopped
• 1 tablespoon olive oil
• 1 medium carrot, shredded
• 1 small zucchini, shredded
• 2 cups reduced-sodium vegetable broth
• 1 cup dry red lentils, rinsed and drained
• 2 (14.5 ounce) cans diced tomatoes
• 1 tablespoon chili powder
• 1 tablespoon prepared yellow mustard
• 1 tablespoon cider vinegar
• 1 tablespoon maple syrup
• 1 tablespoon tomato paste
• 2 teaspoons vegan Worcestershire sauce
• salt
• ground black pepper
• 6 large hamburger buns, split