Prepare a baking sheet with parchment paper, set aside.
Preheat the oven to 375° F.
Rinse the quinoa and lentils until the water runs clean, set aside to drain.
In a medium sized sauce pan add the quinoa, lentils, and water and/or broth.
Cook on a medium high heat and bring to a boil.
Reduce the heat to a medium low and cook for 12 to 15 minutes, or until the quinoa is done, set aside.
While the quinoa and lentils are cooking, clean and dice the fresh onion.
In a medium sized skillet, add the onion, garlic, and oil, cook on a medium high heat until the onion has slightly browned, set aside.
Peel and dice the beets, add to a small sauce pan with water, cook until tender, drain, and mash the beets with a potato masher, set aside.
As everything is cooking, mix together in a small bowl the ground flax seed and water.
Set aside for about 5 minutes, or until it thickens.
Pour everything into a medium sized mixing bowl and blend together.
Once everything is well combined, scoop into a large ball ( about 1/2 cup ), place onto the prepared baking sheet, and squash the ball into a patty.
Continue filling the baking sheet until all the mixture is gone.
Place the baking sheet into the oven and bake for 20 minutes.
After 20 minutes, flip the patties and continue to bake for another 20 minutes.
Remove from the oven and serve as you prefer.