Drain and rinse the Red Kidney Beans. Chop up all the vegetables.
Sautee the Onion in 1½ tsp of Olive Oil util slightly brown.
Sautee the Mushrooms in 1½ tsp of Olive Oil. After a few minutes, add in the Ground Cumin. Continue to sautee until slightly crispy.
Combine the Red Kidney Beans, Onion, Tomato Paste, Liquid Aminos, Garlic Powder, Black Pepper, and Flaxseed Meal in a food processor. Blend until smooth.
Add the Mushrooms into the food processor and blend to mix. You don't want the mushrooms blended smooth.
Move the mixture to a bowl and fold in the brown rice and walnuts (if using walnuts).
Form and ball and refrigerate for 15 minutes. This can be skipped if desired.
Form 6 patties on parchment paper.
Grill at 400°F for 7 minutes on each side. Or you can bake at 350°F for 20 minutes, flipping halfway through.