Kheema with peas

Name: Kheema with peas
Ingredients: 2 tbsp vegetable oil; 2 onions, finely chopped; 1 tbsp grated ginger; 2 garlic cloves, crushed; 750g lean minced lamb or beef; 2 tbsp tomato paste; 250ml water or stock; 1 tsp ground coriander; 1/2 tsp dried red chilli flakes*; 1 tsp turmeric; 1/2 tsp salt; 1/4 tsp pepper; 200g podded peas, fresh or frozen; 1-2 tsp garam masala; 3 tbsp coriander leaves, chopped; * adjust the chilli according to family taste