Preheat the oven to 150 C / 130 C fan / Gas 2. Line a baking tray with greaseproof paper.
Beat the egg whites until stiff with an electric mixer, if you have one it’s best to use a ballon whisk. Then, while the mixer is still going, gradually incorporate the sugar. Beat until glossy, thick and will form stiff peaks. Next, mix in the vanilla extract, and half the lemon zest. Fold in the lemon curd so you create swirls in the mixture.
Sprinkle a little zest on the baking tray and put spoonfuls on the baking tray. Bake for 45 minutes.
When their time’s up, switch the oven off and allow the meringues to cool down in there.
Dust with a little icing sugar and a bit more lemon zest. Serve with ice cream or as an eton mess.