Peri-peri ice cream with roasted watermelon

Place some ice cubes in a bowl. Place the cream, peri-peri powder and vanilla pod in a pot and bring to the boil. Beat the egg yolks until light and fluffy, then slowly add a little of the cream while still beating. Add the egg mixture to the cream and reheat for about 2-3 minutes while stirring until the mixture is thick enough to coat the back of a wooden spoon and starts to steam. (Add the vanilla essence if using.) Pour through a fine sieve into a bowl and place the bowl inside the ice-water bath to cool it down. Stir occasionally until cold. Freeze until hard. Place the watermelon on a heated griddle plate until char-grilled on both sides. Cut into slices. Arrange slices of watermelon on a plate with a scoop of ice cream. Garnish with berries and dust with icing sugar.