Peel, wash and coarsely grate the potatoes. Mix with egg, flour and salt. Fry approx. 8 flat buffers in hot fat from both sides until golden brown. Wash, halve and core the grapes. Carve the vanilla pod lengthwise, scrape out the pulp.
Mix quark, milk, sugar and vanilla pulp. Fold in grapes. Arrange two buffers each with quark. Garnish with mint leaves if necessary