Creamy prawn korma

Name: Creamy prawn korma
Cook time: 45 min
Total time: 45 min
Cuisine: Asian, Indian
Ingredients: 1 tbsp sunflower oil; 2 medium onions, finely chopped; 4 garlic cloves, finely sliced; 20g chunk of fresh root ginger, peeled and finely chopped; 3 tbsp Korma curry paste; 500ml cold water; 2 tbsp double or single cream; 2 tsp caster sugar; 400g peeled raw tiger prawns, deveined if necessary and thawed if frozen; 20g bunch of fresh coriander, leaves roughly chopped; flaked sea salt