Heat oil in a pan, add cumin seeds, fenugreek seeds, fennel seeds, dry red chilli, bay leaf into it, saute it and then add turmeric powder into it, saute it on low flame and then add mango pieces into it and mix it well and cook it for 2 minutes on medium flame and then add salt, black salt, red chilli powder and 1 cup of water into it. Mix all very well.