Creamy Tamarind Sesame Fish Curry

Mackerel 2kg 200mL sesame oil 2 tsp mustard seeds 2 tsp fenugreek seeds 2 tbsp fennel 10-15 cardamom 5-10 cloves 1 cinnamon quill 400-500g shallots 1/2 pandan leaf Curry leaves 2 sprigs 1.5 garlic with skin 2 tsp turmeric 5-6 chillies (to your liking) 3 tomatoes 2.5 tsp coriander powder 1.5 tsp cumin powder Salt to your liking 3 tsp Kashmiri chilli powder 1 tbsp pepper 1 cup concentrated tamarind juice 1L water 3 bay leaves 100-150mL coconut cream