In a small bowl, combine the flaxseed meal with water. Let it sit for 5-10 minutes until it becomes gel-like.

If not using leftovers, cook the lentils and brown rice according to package instructions; set aside to cool.

In a skillet, heat a small amount of oil over medium heat. Add chopped onion and garlic, and sauté until soft and fragrant.

In a large bowl, combine cooked lentils, rice, sautéed onion and garlic, grated beetroot, soy sauce, Worcestershire sauce, smoked paprika, onion powder, black pepper, and salt.

Stir in the prepared flaxseed mixture and breadcrumbs. Mix until well combined. The mixture should hold together but not be overly sticky.

Divide the mixture into equal portions and shape them into burger patties, aiming for about ½ inch thick.

Heat your grill or a non-stick skillet over medium-high heat. Place the patties on the grill or skillet. Cook each side for 4-5 minutes or until golden brown and crisp.

Once cooked, remove the patties and let them rest for a minute. Place each patty on a burger bun, add your favorite toppings, and enjoy!