Put flour, sugar, cocoa and salt in a bowl. Make a depression in the middle. Warm 75 ml of milk lukewarm. Dissolve yeast in it. Pour the yeast milk into the bowl, mix it with some flour from the rim and let it stand covered for about 15 minutes
Melt the fat, add 50 ml of milk, warm up and remove from the heat. Add the egg and fat-milk mixture to the yeast dough and work into a smooth dough with the dough hooks of the hand mixer. Cover the dough and let it rise in a warm place for about 40 minutes until the dough volume has doubled
Knead the dough again and form it into a roll on a well floured work surface. Cut the roll into approx. 15 pieces, form them into balls and press them flat (each approx. 8 cm Ø). Put about 1 teaspoon of jam on each flat cake and form a ball again, pressing the edges well together.
Place the balls on a greased baking tray, cover and let them rise for another 20 minutes. Heat frying oil in a wide pan to 160-170 °C. Use a skimmer to slide 4-5 balls into the hot oil. Fry the balls for 5-7 minutes, turning them carefully. Remove the balls with a skimmer, roll them in sugar and let them cool down
waiting time approx. 1 1/4 hours