1Mix all of the mushroom ingredients, besides the mushrooms, together in a large bowl then add the mushrooms & mix until everything is evenly coated.
2Cover & set aside to marinate while you prepare everything else.
3For the raita: mix all the ingredients together in a bowl then set aside to let the flavours marry.
4For the kachumber salad: mix the tamarind paste & cumin together in a bowl with a pinch of salt then add the cucumber, tomato green chilli & coriander then mix thoroughly so everything is coated.
5To cook the mushrooms: add them to a lightly greased griddle or frying pan over a high heat & cook, pressing down firmly with a weighted object ie. a pan/pan lid, until charred on both sides.
6You could also cook the mushrooms under the grill or in the oven.