One-tin bakes

Grapefruit meringue pie

The grapefruit custard is made on the hob, using cornflour to thicken the custard to make the filling more stable and, therefore, foolproof.

SERVES 12 PREP 20 MINS, PLUS SETTING COOK 5 MINS

For the custard filling:

✱ 350g caster sugar
✱ 50g cornflour
✱ Finely grated zest of 2 ruby grapefruits
✱ Finely grated zest of 3 limes
✱ 360ml ruby grapefruit juice (around 3-4 large grapefruits)
✱ 90ml lime juice (from about 4 limes)
✱ 4 large egg yolks
✱ 160ml double cream
✱ 30g unsalted butter

For the meringue topping:

✱ 4 large egg whites
✱ 300g caster sugar
✱ ¼tsp cream of tartar
✱ 1tsp vanilla bean paste
✱ ¼tsp grapefruit (or other citrus) bitters