Cream butter and 75 g sugar. Separate the eggs
Stir in 1 egg yolk. Add lemon juice. Mix flour and baking powder, stir in. Beat both egg whites until stiff and fold in
Pour the dough into 4 small greased refractory moulds (approx. 150 ml capacity). Bake in a hot oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for about 20 minutes. Cooling
Remove 4 tbsp. of the milk, stir with starch, vanillin sugar and egg yolk until smooth. Bring the cream and the rest of the milk to the boil. Stir the starch and 1-2 tbsp. sugar into the boiling milk, bring to the boil. Stir in orange juice. Season to taste. Dust the tartlets with icing sugar. Decorate with orange strips and lemon balm if desired. Add warm sauce