Peel and dice the onion and garlic. Heat oil (or water to make this oil-free) in a saucepan over medium heat. Add the onion and cook for 4 minutes, stirring frequently. Add the garlic, stir, and cook for another minute.
Add the frozen bell peppers, frozen kale, marinara, cumin, chili powder and mustard. Cover and cook until the veggies are warm. Rinse and drain the canned lentils, then add them to the pan and turn the heat up. The “joe's” are done cooking when everything is hot.
Serve the sloppy Joe mixture on a slice of whole grain bread. Add any veggies or condiments that tickle your fancy. Serve the fresh, crispy snap peas on the side.