In a medium saucepan, combine the rinsed lentils and vegetable broth. Bring to a boil over high heat.

Once boiling, reduce the heat to low, cover, and simmer for about 20-25 minutes or until the lentils are tender but not mushy. Drain any excess liquid and set aside.

In a large skillet, heat the olive oil over medium heat. Add the diced onion and bell pepper.

Sauté for about 5-7 minutes until the vegetables are softened and the onion is translucent. This step builds the flavor base for your sloppy joes.

Add the minced garlic and cook for an additional 1-2 minutes until fragrant.

Stir in the cooked lentils, tomato paste, Worcestershire sauce, smoked paprika, ground cumin, chili powder, diced tomatoes, salt, and black pepper.

Mix well to combine all ingredients and let the mixture simmer for about 10 minutes on low heat. This allows the flavors to meld together.

Toast the burger buns lightly if desired. Spoon a generous amount of the lentil mixture onto the bottom half of each bun.

Top with shredded lettuce and sliced tomato, then place the top half of the bun over the filling.

Serve immediately with your favorite side dishes, such as sweet potato fries or a simple salad.