First-order Type-I Curry - Cooking like a Boss

A generic, tasty curry recipe which is about as quick to make as a jar curry but has actual flavour. Stolen from BBC Good Food.

oil		fry until soft	fry briefly	bring to boil	cover on medium-high for 5-6 minutes or chicken cooked	simmer and stir in
3 red onion	thinly sliced
3 clove garlic
6 tsp 0.03 l 30 ml 2 tbsp 0.127 cup 0.053 pint ready-prepared ginger
3 tsp 0.015 l 15 ml 1 tbsp 0.063 cup 0.026 pint ready-chopped chillies
600g ³⁄₅kg 1.32lb 21.2oz chopped tomatoes
150ml 0.15l 10tbsp 30tsp 0.634cup 0.264pint water
600g ³⁄₅kg 1.32lb 21.2oz chicken	cubed
6 tsp 0.03 l 30 ml 2 tbsp 0.127 cup 0.053 pint garam masala
9 tbsp 0.135 l 135 ml 27 tsp 0.571 cup 0.238 pint yogurt
3 handful coriander leaves	roughly chopped