Add all ingredients, except wheat gluten, to a food processor and puree until fully mixed. You can save some of the beans and onions if you want a few chunks in your burger.
Pour wet mix into a bowl with the wheat gluten. Using your hands or a heavy wooden spoon mix until no dry remains. Let sit for 5 minutes to let the gluten relax some.
Roll into a foot long loaf. Cut to divide into 8 patties. Using your hands shape into a patty that is about 1/2" thick. Place patties on parchment lined baking sheets.
Bake for 20 minutes. The patties will look and feel dry and hard. That's the goal.
Continue to the next step only if you will be eating them right away. If you are planning on prepping patties for future meals see the notes below.
Fill a saute pan with an inch of water. Add 1 tsp of soy sauce. Boil the patties in the shallow water for 5 minutes on each side.
Repeat as necessary based on your saute pan size.
They are ready to be eaten or thrown on the grill for 30 seconds on each side. No additional cooking is needed but those grill marks are a nice visual.