I just found this recipe, it sounds good! 3.8 grams of fat per portion (I would imagine that's one burger).
4 ounces of mushrooms, finely chopped
1 small onion, chopped
1 small zucchini, chopped
1 carrot, chopped
1 oz unsalted peanuts or cashews
2 cups fresh bread crumbs
2 TB chopped fresh parsley
1 tsp yeast extract
salt and black pepper
fine oatmeal or flour, for shaping
Cook the mushrooms in a nonstick pan without oil, stirring for 8-10 minutes to remove all moisture. Process the onion, zucchini, carrot, and nuts in a food processor until beginning to bind together. Stir in the mushrooms, bread crumbs, parsley, yeast extract and seasoning to taste. With the oatmeal or flour, shape into four burgers. Cook the burgers in a nonstick pan with very little oil or under a hot broiler until the burgers are cooked and golden brown.
Credit to Christine France's Low Fat, Low Cholesterol Cookbook.