Cover the breast with foil, beat off. Combine ginger, pepper and salt, add butter, stir, grate the turkey, brush with yolk on top. Place the breast on a baking sheet. Cut the potatoes into thin slices, mix with vegetable oil and rosemary, and place around the breast. Place in an oven preheated to 200 ° C for 15 minutes. Then remove from the oven, cover with foil. Cut the turkey into portions, put the potatoes on a plate next to it. Serve with your favourite meat sauce or jam (cherry, currant)