Peel the mangoes and then cut either side of the stone, giving you two thick slices of the fruit. Cut the opposite ends of the mango away from the edge of the stones. Any remaining fruit should be scraped off into a bowl. Cut the large fruit slices into thick strips.
Stir the sugar, mixed spice, turmeric and cayenne into the mango. This is now best left for a good few hours to ‘marinate