Masala Veggie Burgers

Name: Masala Veggie Burgers
Cuisine: Indian, Asian
Ingredients: 3 medium potatoes, boiled, cooled, peeled; 1 cup quinoa cooked and cooled; 3/4 cup plain bread crumbs; 2 tsp vegetable oil; 2 tsp fennel seeds; 1 cup white onion finely chopped; 3 garlic cloves; 1 inch ginger; 1 tsp red chili powder; 1 tsp turmeric powder; 1 1/2 tsp garam masala; 1 tsp cumin; 2 tsp kosher salt; 3 medium beets washed, peeled, and grated; 1 tbsp cilantro; 1/2 cup cold seltzer water; 1 medium red onion thinly sliced; 4 slices vegan pepper jack cheese