Cauliflower tikka masala

For the roasted cauliflower

• 1 large head of cauliflower (you need approximately 1kg of cauliflower)
• 2 tbsp vegetable oil
• 2 tsp garam masala
• ½ tsp chili powder
• 2 tsp ground coriander
• ½ tsp Turmeric
• 2 tsp salt

For the tikka masala curry

• 1 onion finely chopped
• 3-4 garlic cloves crushed
• 2 tsp ginger grated/crushed
• 2 tsp garam masala
• 2 tsp paprika
• 2 tsp ground coriander
• 1 tsp ground cumin
• 1 tsp Turmeric
• ½-1 tsp chili powder
• ½ tsp ground cardamom
• 2 g/14oz cans crushed tomatoes
• 2 tbsp tomato paste
• 1 cup heavy/whipping cream
• 2 tbsp butter
• 1-2 tsp sugar
• salt and pepper to taste