In a pan or pressure cooker, boil beetroot and potatoes with salt and enough water for 7-8 whistles on medium flame.
Drain the water, then peel and grate both the beetroot and potato into a bowl for an even, smooth mixture.
Add spices, green chili, salt, and corn starch (or rice flour/soaked bread slices) to the grated mix.
Mix everything well using your hands and shape the mixture into round patties or tikkis.
Spread roasted semolina (rava) on a plate, then coat each tikki evenly with the semolina, dusting off any excess.
Heat 2 tablespoons of oil in a pan and fry the tikkis until they are crisp and golden on both sides.
Place the fried tikkis on kitchen paper towels to absorb excess oil and serve hot with your favorite chutney, dip, or sauce.