1.Whisk whole eggs, yolks and sugar in a small heavy-based saucepan until smooth. Add rind, juice and butter, whisking continuously over low heat for 5 minutes or until curd thickens. Do not allow mixture to get too hot or it will curdle.
2.Transfer curd mixture to a stainless steel bowl, then place over a bowl of iced water, stir with a whisk occasionally for 5 minutes to cool to room temperature.
3.Place curd in the freezer for 5 minutes to accelerate chilling, but don’t forget it, or it will freeze.
4.Meanwhile, beat cream in a small bowl with an electric mixer until soft peaks form.
5.Spoon rounded tablespoons of curd into tart shells, top with cream, serve immediately. Dust with icing (confectioners’) sugar just before serving if you like.
You will need about 2 lemons for this recipe. You can freeze the unused egg whites and use them later in friands, omelettes or a pavlova. VARIATIONS You can make this recipe with other citrus fruit, simply replace the lemon rind and juice with the same amount of rind and juice of whatever citrus fruit you like lime, orange, blood orange, mandarin, grapefruit and tangelo would all work well. For a completely smooth lemon curd, strain the mixture through a fine sieve to remove the tiny pieces of rind. Lemon curd can be made ahead and will keep for several weeks in the fridge.