Directions

• Put the sugar, lime zest and juice into a saucepan with 500ml water and bring to the boil, stirring to dissolve the sugar. Turn the heat down a little and simmer for 4 minutes. Leave to cool.
• Pour the liquid through a nylon sieve into a shallow metal container that will fit into your freezer. Cover with clingfilm and put in the freezer.
• After about 40 minutes the mixture should have started to freeze round the edges. Stir this, mixing the frozen bits with the central pool. Continue to break up the frozen mixture every 45 minutes until you have something that looks like coarse snow.
• Peel the mango and slice the flesh from the stone, cutting close to the stone so your remove the plumpest possible bit of the mango. Cut the firm flesh into slices.
• Divide the mango slices between six plates and squeeze lime juice all over them. Sprinkle over a little salt and chilli flakes. Serve spoonfuls of the granita alongside.