1. After mixing the flour, salt and sugar, add yeast water, knead the dough, add butter and continue kneading until the dough is smooth.
2. Cover with plastic wrap and leave for 2 hours.
3. Peel the yam and finely chop the onion.
4. Put butter in the pan and melt the butter over low heat.
5. Add yam and stir fry.
6. Add chopped onion and continue to fry. Stir fragrant.
7. Add tomato sauce and salt and continue to stir fry.
8. Add basil, black pepper, and a little sugar and keep stirring until it becomes thick. Cool down for later use.
9. Process all the fillings.
10. Take out the fermented dough and use a rolling pin to roll it into a round shape, which is larger than a pizza pan.
11. Apply a small amount of oil to the baking pan to prevent sticking. Then put the dough in the baking pan.
12. Arrange the mozzarella (about 8 strips) that are cut to a width of one centimeter along the sides of the cake and roll them up with dough.
13. Punch some small holes in the dough with a fork.
14. Spread a layer of pizza sauce that has just been made.
15. Sprinkle another layer of mozzarella cheese.
16. Sprinkle the sausage evenly.
17. Place corn kernels and peas and crab sticks in order.
18. Finally put the bacon on it.
19. Brush the pizza with egg mixture, and add half of the shredded mozzarella cheese.
20. Bake in the oven at 220 degrees for 12 minutes, take out and sprinkle all the remaining cheese, and brush the egg mixture again.
21. Bake for another 6-7 minutes to color the surface of the pizza and melt the mozzarella cheese.
