Rich and tasty slow cooker butter halloumi curry recipe

Name: Rich and tasty slow cooker butter halloumi curry recipe
Prep time: 15 min
Cook time: 3 h
Total time: 3 h 15 min
Cuisine: Asian, Indian
Ingredients: 8 cardamom pods; 1 tsp. fenugreek seeds; 2 tsp. cumin seeds; 1/2 tsp. cayenne pepper; 1 tsp. ground turmeric; 2 garlic cloves, chopped; 2 1/2 cm piece fresh root ginger, peeled and grated; 40 g butter or ghee, melted; 1 onion, chopped; 400 g tin chopped tomatoes; 1 tbsp. tomato puree; 1 tbsp. mango chutney, plus extra (optional) to serve; 500 g halloumi, cut into 2cm cubes; 1 cinnamon stick; 100 mL double cream; Large handful fresh coriander leaves, roughly chopped