Full-On Taco Bar

Ingredients

• 2 large sweet onions, chopped (2 cups)
• 1 red bell pepper, chopped (1 cup)
• ½ fresh jalapeño pepper, seeded and finely chopped
• 2 cloves garlic, minced
• 3 cups cooked brown lentils or two (15-ounce) cans lentils, drained and rinsed
• 1 (15-ounce) can fat-free vegetarian refried beans
• 1 cup vegetable stock or water, plus more as needed
• ¼ cup reduced-sodium taco seasoning mix
• 12 6-inch corn tortillas, warmed
• Toppings such as shredded lettuce, chopped tomatoes, red onion, avocado, fresh cilantro, and salsa or taco sauce