Put the onion, garlic and chilli in a food processor. Pulse until you get a coarse paste, add the beetroot & coriander and pulse for 5 seconds. Add the cumin, paprika and rice flour.
Transfer the mixture into a mixing bowl. Add the rice flour, lemon/lime zest, season well then combine. Now, add enough oat meal/maze flour( or fine polenta) to get a thick, doughy mixture.
Divide the mixture into 6-8 equal portions and form patties. Put these on a plate, cover and chill until you’re ready to cook them.
Heat a grill, griddle pan or frying pan.
Spray the patties with oil, then cook them until golden.
Serve warm.