How to cook
Heat the butter and using a whisk, beat it with the eggs and sugar. Add the salt, lemon zest, flour, cream and brandy and whip until you get a homogeneous mixture. Remove the seeds from the apples using an apple corer without cutting them.
Then cut them into rings about 1/2″ (1 cm) thick. Heat oil in a large pot to 356°F (180 °C). Dip each apple ring into the dough with a fork and carefully put it in the hot oil. Fry the apple donuts until golden on both sides, while also gently turning them with a slotted spoon.