Make the flax eggs: in a small bowl, combine the ground flax with 6 tbsp. warm water, stir, and set aside for at least 10 minutes.
Make the brown rice according to package directions.
Prepare all the veggies and set aside.
In large frying pan, cook the onion and garlic for about 5 minutes. Then add the red bell pepper, carrots, and cook for 10 more minutes. Add the mushrooms and cook for 5 minutes, then add the black beans and cook for an final 3 minutes.
In a very large bowl, mix the oats, black beans, veggies, flax mixture, mustard and soy sauce. Fold in the chopped pecans.
Form the mixture into patties. Heat a large frying pan and coat with olive oil. Cook the patties, about 5 minutes per side, until golden.
Serve on buns with toppings of your choice: caramelized onions, veganaise, jalapeños, lettuce are my faves.