I recommend measuring the ingredients in grams using a kitchen scale. You can watch the video for visual instructions.
If using whole chia seeds, grind 2 tablespoons into a fine powder (that will yield 3 tablespoons of ground chia seeds). Mix with the water and set aside to thicken.
Roughly chop the onion and garlic. Peel the beet and grate it.
Add the sunflower seeds, oats, onion powder, smoked paprika, cumin, and salt to a food processor. Process until coarsely ground.
Add the onion, garlic, kidney beans, soy sauce or tamari, tomato paste, and half of the grated beet. Pulse several times, scraping down the sides as needed.
Add the remaining beet and thickened chia mixture. Pulse until evenly combined. Do not overprocess; the mixture should retain some texture.
Divide the mixture into 7 portions and shape each into a burger patty. Press gently to create an even thickness.
Heat a little oil in a large skillet over medium heat. Fry the patties until firm and browned underneath, then carefully flip and cook the other side. Work in batches and add more oil if needed.
Slice the vegetables and prepare your favorite dressing or burger sauce.
Cut the burger bun in half and spread with sauce. Add lettuce, a warm beet patty, vegetables, and more sauce. Top with the other bun half and serve immediately.