How To Pre-Cook Chicken - British Indian Restaurant Method

Hi guys, just a simple video on how to make the pre-cooked chicken the way I do it in my Restaurant.
For 2 kg chicken / cut in 1 inch cubes
Less then a cup vegetable oil
*4 heaped tsp garlic & ginger paste
*Spice mix - 2 tsp salt, 2 tsp curry powder, 1 tsp turmeric powder, 1 tsp coriander powder, 1 tsp cumin powder, 1 tsp Kashmiri chilli powder, 1 tsp garam masala powder
*3 heaped tbsp tomato puree
2-3 cups of water (enough to cover the chicken)