Heat 2 tablespoon butter and 2 teaspoon oil. Add cardamom pods and fry until fragrant. Add onions and cook until golden brown. Add ginger/garlic paste
Add turmeric, cumin, coriander and chilli powder. Cook for 2 minutes. Add a few drops of water if required
Add the tomato passata together with the water. Mix well. Simmer on low heat for 10-15 minutes, giving it a few stirs, until sauce thickens a little
Once sauce is cooked, pour into a small glass bowl and blend until smooth
Return sauce to the pot and add the cream and sugar together with 1 tablespoon butter
Turn the heat to high. Add the chicken and bring to a quick boil. Turn off the heat. Chicken will cook further in the sauce
Garnish with coriander