Warm the milk slightly, mix in the freshly brewed coffee, then crumble in the yeast. Add a teaspoon of sugar and let it stand for 10 minutes, until foamy.
In a large bowl, combine the flour, the remaining sugar, and the salt. Pour in the proofed yeast mixture, the melted butter, and the eggs. Start mixing to form a dough.
Knead the dough thoroughly for 10 minutes, until smooth and elastic. If necessary, add a little more flour or milk to achieve the desired consistency.
Cover with a kitchen towel and let rise in a warm place for about 1 hour, or until doubled in size.
On a lightly floured surface, roll out the dough to about 1 cm thickness. Use a glass or donut cutter to cut out circles.
Let the donuts rise for another 30 minutes to make them even lighter during frying.
In a deep skillet or saucepan, heat the oil to 340-355°F (170-180°C). Fry only a few donuts at a time, to keep the oil temperature stable.
Fry the donuts for 2-3 minutes per side, until golden brown. Remove them to a paper towel-lined plate to drain excess oil.
To make the coffee glaze, mix powdered sugar with freshly brewed coffee until you get a thick glaze.
Dip the tops of the donuts into the coffee glaze, then let it set.
Serve the donuts fresh, to fully enjoy the coffee flavor.
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