Put your tofu on to press, ideally using a tofu press, or by placing it on a plate with another plate on top of it, and then placing something heavy on top like a heavy pot. Leave it to press for around 20 minutes while you prepare your other ingredients.
Add the walnuts to the food processor and process into crumbles. Place the walnut crumbs into a mixing bowl.
Add sliced mushrooms to the food processor and process until finely chopped. Add into the mixing bowl with the crushed walnuts.
Add the lentils to the mixing bowl.
When the tofu is finished pressing mash it with a fork and then add it to the mixing bowl with the walnuts, mushrooms and lentils. Mix it all up together.
Add the chopped onions and crushed garlic to a pot with the olive oil and sauté until the onions are softened.
Add the paprika, cumin, cayenne pepper, oregano and dried basil along with the chopped celery and red pepper and sauté to soften the veggies slightly and toast the spices.
Now add the walnut, mushroom, lentil and tofu mix along with the soy sauce, marinara sauce and tomato paste and fry until you have a mince consistency.
Add coconut sugar (for flavor balance), black pepper and salt to taste.
Serve on fresh or toasted hamburger buns with some sliced avocado, black pepper and fresh basil.