Saute onion, green pepper and garlic in a bit of water or broth. Combine with lentils, veggies and carrot in food processor bowl, and chop.Mix in the rest.
Heat a non-stick or sprayed large skillet or griddle. Spoon burger-sized blobs of the mixture onto the hot surface. Flatten slightly. Lower heat to medium, cook till browned on bottom. Turn and cook till othe side is browned.
Notes: I used frozen peas and corn as the vegetables because that was what I had available. You could use any veggies, depending on your taste. I got 15 smallish burgers out of this, giving three per serving.