Masala chicken with potatoes

Ingredients

• 1 tbsp (15 ml) sunflower oil
• 6 chicken breasts on the bone, halved and skin and all fat removed
• 2 large onions, thinly sliced
• 1 clove of garlic, finely chopped
• 1 cm piece fresh ginger, grated
• 3-4 cardamom pods
• 1 large cinnamon stick
• 1 tbsp (15 ml) ground cumin
• 2 tsp (10 ml) chilli powder or to taste
• 2 tsp (10 ml) ground coriander
• 1 tsp (5 ml) each turmeric and garam masala
• 3 tomatoes, finely chopped
• 1 tbsp (15 ml) tomato paste
• 2 cups (500 ml) water or Homemade stock
• 3 potatoes, cubed
• 1 tsp (5 ml) salt
• ½ cup (125 ml) buttermilk or plain low-fat yoghurt (optional)