Korma Murg Curry Korma Style Chicken Curry

Name: Korma Murg Curry (Korma-Style Chicken Curry)
Ingredients: 2 tablespoons sunflower oil; 1 cinnamon stick, broken up into small pieces; 2 onions, roughly chopped; 1 green chile, roughly chopped; 2 garlic cloves, roughly chopped; 1-inch piece of fresh root ginger, peeled and roughly chopped; 50g (⅓ cup) cashew nuts (about 28 cashews); 1 tablespoon white poppy seeds (see headnote); 100ml (3 1⁄2 fl oz) water; 1 teaspoon salt; 1 teaspoon garam masala; 1 teaspoon chile powder; 200ml (7fl oz) boiling water; 650g (1lb 7oz) boneless, skinless chicken thighs, cut into 5cm (2 inch) pieces; 1 tablespoon heavy cream; ¾ cup fresh cilantro leaves, finely chopped