Burger baps at the ready, you’ve just discovered the best vegan burgers around!
Place the walnuts into a food processor, blend until finely ground and transfer to a mixing bowl.
Add the mushrooms to the food processor until chopped then spoon in the butter and process until combined. Scoop the mushroom mixture into the mixing bowl with the walnuts.
Tip in the cooked bulgur wheat or brown rice a long with the oats, grated beetroot, mayonnaise, soy sauce, salt, pepper and garlic and mix. Chill for 1 hour.
Shape the mixture into 10 patties, heat a grill pan over a high heat, add cooking oil and cook the patties until heated through and lightly charred (around 3 minutes on both sides).