Harissa beef skewers with avocado dip
These tasty spiced skewers work just as well with lamb or chicken. For a vegetarian alternative, use chunky pieces of halloumi cheese
Put the grapefruit juice, most of the mint and the sugar in a large jug. Crush the ingredients together with the end of a rolling pin to release the flavour from the mint and dissolve the sugar. Add the rum, mix well and top up with soda water and ice. Add the sliced grapefruit and remaining mint before serving.