Preheat oven to 400℉ and spray baking sheet with oil.
Cook brown lentils and let cool.
Cook/brown ground beef and let cool.
In a large bowl, mash up brown lentils and kidney beans until they form a paste - some whole beans are okay.
Add in the rest of the ingredients (ground beef, onion, garlic, bread crumbs, nooch, soy sauce, lemon juice, oil and seasonings), and mix well with your hands until well incorporated. Add a little bit more bread crumbs if you feel your unable to form balls with your mixture.
Roll the mixture into balls around the size of a golf ball - does not need to be perfect. You will get 20-24 depending on how big you make the balls.
Coat the meatballs with a little bit of oil and bake for 25 minutes - flipping halfway.
While the meatballs are cooking, make the tomato sauce and or rice to plate it with.
When the meatballs are done, if creating a sandwich spoon a generous amount of sauce on the bottom of the bread, put your desired amount of meatballs (3-4), cover with mozzarella cheese, place more sauce on top before closing the sandwich. If serving over rice, place on top of rice, cover with cheese then cover with the hot tomato sauce. Serve immediately.