2 lemons, rind finely grated
1/2 cup lemon juice
100g unsalted butter
2/3 cup caster sugar
2 tsp arrowroot
3 egg yolks, whisked
12 frozen tart cases
3 egg whites, at room temperature
Pinch of salt
3/4 cup caster sugar
Preheat oven to 350 degrees F.
Place tart cases on a baking tray. Bake for 10-12 minutes, or until golden. Cool.
Stir lemon rind, juice, butter and sugar in a pan over low heat until sugar dissolves and butter melts. Remove from heat.
Mix arrowroot with a little water to make a smooth paste. Whisk arrowroot and egg yolks into lemon mixture. Return to low heat and whisk until mixture comes to the boil and thickens. Transfer to a bowl and cool. Refrigerate.