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
5 red onion	thinly sliced
5 clove garlic
10 tsp 0.05 l 50 ml 3 ¹⁄₃ tbsp 0.211 cup 0.088 pint ready-prepared ginger
5 tsp 0.025 l 25 ml 1 ²⁄₃ tbsp 0.106 cup 0.044 pint ready-chopped chillies
1000g 1kg 2.2lb 35.3oz chopped tomatoes
250ml ¹⁄₄l 16 ²⁄₃tbsp 50tsp 1.06cup 0.44pint water
1000g 1kg 2.2lb 35.3oz chicken	cubed
10 tsp 0.05 l 50 ml 3 ¹⁄₃ tbsp 0.211 cup 0.088 pint garam masala
15 tbsp 0.225 l 225 ml 45 tsp 0.951 cup 0.396 pint yogurt
5 handful coriander leaves	roughly chopped