Lightly toast the dried chillies and all the whole spice seeds
Cool and going to a powder, add the ginger and garlic paste and 1 tbsps of the regular oil and 2 of the mustard oil and grind with a little water if too dry
In a saute pan heat up the rest of the oils and add the curry leaves and ground paste
Add turmeric and the tomato paste and the water and cook for a minute or so and allow to cool completely
Cut the chicken into cubes and add the achari masala and marinate it overnight
Skewer this with some wedges of lemon and quarters of onion
Sprinkle with some fennel, cumin & black onion seeds
Heat the BBQ and grill it on one side before flipping it over o all sides to cook
In between baste with a mixture of regular and mustard oil