1. Cut the butter into pieces and beat them with a hand blender
2. Put the eggs and beat them evenly
3. Flour, minced lemon peel, sugar, vanilla syrup, pour into the butter and egg mixture and beat well
4. After the batter is made in the previous step (about 2 minutes), it should be as shown in the picture, there are no particles
5. Pour the batter into a paper cup, put it in the oven after preheating 180 degrees, and bake for about 15 minutes
6. Use a knife to cut a slice flat on the top of the cupcake, then cut in half from the middle, and insert it back onto the cake to make a butterfly shape as shown in the picture. You can also put on the lemon butter sauce before inserting
