heat the oil and add onion and garlic heat over low heat and a leftover or cooked or canned medium carrot , until onions soft,about 4 minutes.Add the cumin,ground coriander and turmeric and cook for one minute.Add mushrooms stirring until soft and dry.Remove pan.
tip the lentil into bowl and puree to your liking,stir in mushroom mix,add fresh coriander and season with salt and pepper.Mix well.With flourred hands, form into flat burger shapes,if mixture is to sticky mix with a little flour.Preheat grill.Brush the burgers with oil and grill them for about 8-10minutes turning once until golden brown,or you can cook them on bbq using a wire rack to make turning easy. Serve with natural greek yogurt or sour cream
if you find the lentil / mushroom mix is to loose use blender,add a cup of boiled brown rice to make a more mashy mixture
if you want to make a crust, roll shaped burger first in flour ,next into whisked egg and last into homemade breadcrumbs