Add your peppers, onions and mushroom to a food processor. Pulse until all is roughly chopped and around the same size. Sauté this mixture in a pan over medium heat until most of the moisture has cooked out (optionally sprinkle salt to draw out more water). Remove from pan and set aside.
In a small food processor add the oats and spice and blend until roughly combined.
Then in a large bowl add the lentils, cooked veggies, blended oats and ketchup and mash to form the patty mix and it holds shape.
Form patty on a tortilla and cook patty side down and optionally add a weight on top to keep it flat. Flip after about 3-5 mins, add cheese and steam to melt.
For burger sauce add all ingredients in a small bowl and mix.
Then assemble with toppings of choice and enjoy.