1. Bring 4 cups water, celery, onion, soy sauce, onion powder, garlic powder, and pepper to a boil in a pot over medium heat. Reduce heat to medium and simmer 5 minutes. Stir in oats, mushrooms and flour and cook 5 minutes more. Transfer to a bowl and chill.
2. Preheat oven to 350°F; coat baking sheet with cooking spray. Shape mixture into patties and bake on prepared baking sheet for 15 minutes. Flip and bake 10 more minutes. Cool.
3. Heat grill to medium-high. place foil on grill and coat with cooking spray. Grill burgers on foil for 7 minutes per side. Serve.
4. Red Pepper Ailoi:.
5. Puree all ingredients in blender until smooth. Season with salt and pepper.