Warm up the milk and pour it in a jug.
Add the yeast, a teaspoon of flour and a teaspoon of sugar, and set aside for at least 10 minutes so that the yeast can become foamy and rise.
In a large bowl, add the flour, the rest of the sugar, zest of one lemon, egg and butter. The butter and egg should be at room temperature.
Now pour over the milk and mix everything well with your hands.
Transfer the dough to the working surface and knead it for at least 5 minutes, it will become elastic. Use a bit more flour if it's too sticky.
Shape the dough into a ball.
Oil the bowl and place the dough in it, oiling it lightly as well.
Cover with cling film and wrap the bowl with a clean tea towel.
Leave it to proof for at least 1 hour, so that it can double its size.
To make the chocolate glaze, bring the cream to a boil, then add the chocolate broken into pieces, give it a good stir, so that the chocolat can melt, then take it off the heat.
When the dough is double its initial size, transfer it to the working surface again.
Use a rolling pin to flatten it and cut round circles, and a smaller cirles in the middle, cookie cutters will be good, otherwise a glass and a plastic bottle lid can work too.
Place the dough rounds on the baking tray and again leave to proof for about 1 hour.
Preheat the oven to 200 degrees C. (390 degrees Fahrenheit).
Bake the doughnuts for about 10-15 minutes, keeping an eye on them so that they don't burn.
Leave to cool, then dip them into the chocolate sauce to coat the top. You can adds some sprinkles too if you like.