Potato and green pea curry

Name: Potato and green pea curry
Prep time: 15 min
Cook time: 50 min
Total time: 50 min
Yield: 4 portions
Ingredients: 80 g filtered water; 1 brown onion; 3 cm piece fresh ginger; 4 garlic cloves; 60 g extra virgin olive oil; 2 tsp tomato paste; 1 tsp ground cumin; 1 tsp ground coriander; ½ tsp ground turmeric; ½ tsp chilli powder; 400 g coconut milk; 1 tsp salt; ½ tsp ground black pepper; 500 g potatoes; 400 g canned chopped tomatoes; 600 g frozen peas; fresh coriander