Cauliflower korma curry

For the roasted cauliflower

• 1½ kg/ 3.3lbs cauliflower florets and stems (approximately 2 large heads of cauliflower)
• 3 tbsp oil
• 1 tbsp garam masala
• ½ tsp ground cinnamon
• ½ tsp ground turmeric
• ½ tsp ground coriander
• ½ tsp ground cumin
• 2 tsp salt

For the korma curry

• 1½ cups raw cashew nuts
• 2 tbsp butter/ghee
• 1 large onion finely chopped
• 4 garlic cloves crushed
• 3 tsp crushed ginger
• 1 tbsp garam masala (you can also use Korma curry powder)
• 1 tsp ground coriander
• 1 tsp ground cumin
• 1 tsp ground turmeric
• ½ tsp ground cardamom
• ½ tsp ground cinnamon
• 1 tsp chili powder
• 2 cups stock/broth
• 1 cup cream
• 2 tsp sugar (optional)
• salt and pepper to taste