1. Cut potatoes into small pieces and steam them in a pot. Cut sausage into pieces. Add appropriate amount of black pepper, 20 grams of butter to soften, season with appropriate amount of salt, mix well and set aside.
2. Put the egg liquid, water, sugar, flour, milk powder and yeast into the bread machine and knead for ten minutes.
3. After ten minutes, add butter and continue kneading for half an hour.
4. Pull out the membrane and knead the dough, and the fermented dough will be 2.5 times larger.
5. Exhaust on the chopping board is divided into 8 equal parts, rounded and left for ten minutes.
6. Roll out the filling, close the mouth and squeeze it tightly.
7. Put it in the baking tray and ferment.
8. Make it to 1.5 times the size, use a sharp knife or scissors to cross the egg yolk.
9. Preheat the oven in advance, and heat up and down at 160 degrees for 25 minutes on the middle and lower levels. The specific temperature and time depends on your own oven.
