500gQuark cheeseWaitrose or Ocado stock it, although my little Waitrose didn't have it in store
125gunsalted butter
150gcaster sugar
½teaspoonvanilla extract
2tablespoonsfresh lemon juice
Zest of 1 lemon
75gcorn flouror Maizena from Ocado
1teaspoonbaking powder
Instructions
Line a 20 cm cake pan with parchment paper.
Preheat oven to 180ºC.
Separate the egg whites from the yolks (make sure the bowl is clean and dry), fit the butterfly and beat the egg whites: 3.5 minutes, speed 4, measuring cup off (the TM7 doesn't have a measuring cup, it has a lid cap). Add the ¼ teaspoon cream of tartar and the pinch of salt gradually, until it's stiff. Reserve in a big bowl.
Fit the butterfly whisk again and add to the Thermomix bowl 500 g quark cheese, the 125 g butter, the 150 g sugar, the half teaspoon vanilla extract, the 2 tablespoons of lemon juice and the lemon zest: 5 minutes, speed 3 (2 if it moves too much), measuring cup off (in the TM7 this is the lid cap). Add the egg yolks one by one once it's started going, when there are about 3.5 minutes remaining on the timer, or plonk them in with the other ingredients.
Remove butterfly whisk and add 75 gr corn flour (Maizena) and 1 teaspoon of baking powder: 2 minutes, speed 3.
Add the quark mix to the bowl where the whisked egg whites have been reserved and fold the egg whites in.
Pour the mix into your chosen oven tray, mine in a Pyrex dish, square (approx 20 x 20 cm). Place in the oven: 45-55 minutes, 180ºC. Take out when a skewer pricked in the middle comes out clean. Let it stand in the Pyrex, it will shrink a bit and then it will pop out easily, leave it to cool on a cooling rack.