Simple mushroom curry - Good Food Middle East

Ingredients

• 50g unsalted butter
• 500g chestnut mushrooms, quartered
• 4-6 tbsp sunflower oil
• 1 tsp cumin seeds
• 1 tsp fennel seeds
• 1 large onion, finely chopped
• 4 garlic cloves, finely chopped
• 1 tsp ground ginger
• ¼ tsp ground turmeric
• ½ tsp Kashmiri chilli powder
• ½ tsp garam masala
• 400g can chopped tomatoes
• 1 tsp caster sugar
• 2 tbsp thick, full-fat Greek yogurt
• 2 tbsp chopped coriander
• cooked rice or naan, to serve