May substitute cooked black beans for soybeans for a more Southwestern flavor. If you try this, add a touch of ground cumin to the mixture before blending or processing. Delicious topped with salsa.
Combine avocado, soybeans, onion, mustard, tomato puree and sea salt in a blender or food processor until smooth. Transfer to a bowl and turn in bread crumbs until mixture holds together. Shape into patties. In a heavy skillet, fry in oil until browned on both sides. Toast buns as desired and serve with lettuce, tomato, and your favorite condiments.