First, make the mint tzatziki sauce. You can even make it the day before, it just tastes better as it absorbs flavor.
Place the Greek yogurt, mint, cilantro and lemon juice in a food processor and puree until smooth. Then stir in cucumber, and season with salt and pepper to taste. refrigerate until ready to serve.
To make the falafel, clean out the food processor and puree the falafel mix, water shredded beets and sumac if desired until combined. Let sit for 10-15 minutes to absorb the water.
Form falafel mix into 1-inch balls or small patties (you should get between 9-12 balls, I got 10. Mine were a little big!)
Heat 1/2 inch oil to 350 degrees F in a heavy bottomed pot. Fry falafel 2 minutes per side until browned and crunchy. Blot off excess grease and season with salt.
Serve falafel in pita with mint tzatziki sauce, more herbs, chopped hard boiled egg, or whatever else you like!