4 garlic cloves, roughly chopped
5cm/2in piece fresh root ginger, peeled and roughly chopped
half a lemon, juice only
1 tsp black peppercorns
chaat masala, to season
1 tsp kashmiri chilli powder (or mild chilli powder)
30g/1oz cornflour
1 tsp fennel seeds
80g/3oz gram flour
salt, to taste
vegetable oil, for deep-frying
500g/1lb 2oz boneless chicken thighs, cut into bite-size pieces