Mix 250 g sugar, 1 vanilla sugar and starch. Preheat the oven (electric cooker: 150 °C/circulating air: 130 °C/gas: see manufacturer). Wipe the bowl with some lemon juice. Prepare a meringue mixture from egg white, 2 tbsp. lemon juice and the sugar-starch mix.
Line a fat pan (deep baking tray; approx. 32 x 39 cm) with baking paper. Brush thinly with oil. Spread the beaten egg white evenly on top. Sprinkle with almonds. Bake in a hot oven for about 35 minutes on the middle shelf. The surface should be crispy. Remove and leave to rest on the baking tray for approx. 5 minutes.
Mix mascarpone, quark, 75 g sugar and 1 vanilla sugar briefly with the whisks of the mixer. Chill for about 1 hour. Stir Lemoncurd until smooth.
Dust a piece of baking paper the size of a baking tray evenly with 3 tablespoons of icing sugar. Fold the meringue base onto it. Carefully remove the baking parchment. Let meringue cool down.
Spread the mascarpone cream evenly on the meringue base, leaving a rim of about 2 cm all around. Put curd as a blob on the cream and smooth it down. Roll up from the short side using the baking paper. Arrange on a plate, dust with 1-2 tbsp. icing sugar and serve immediately.