Cheesecake

• 100 g white sugar

Cheesecake base

• 125 g unsalted butter, cut into pieces, plus extra to grease
• 30 g white sugar
• 1 egg
• 1 egg yolk
• 250 g plain flour, plus extra to dust
• 1 tsp baking powder

Topping

• 5 eggs, separated
• 1000 g quark (see Tips)
• 250 g white sugar
• 80 g cornflour
• 650 g milk
• 120 g vegetable oil
• 1 pinch sea salt