1. Preheat the oven to 190°C or 375°F. Line a baking sheet with parchment paper.

2. In a large mixing bowl, combine 250g or 2 1/4 cups of flour, 100g or 1/2 cup of sugar, and 6g or 1 teaspoon of baking powder.

3. Add 115g or 1/2 cup of softened butter to the bowl and mix until the dough comes together.

4. In a separate bowl, whisk together 120ml or 1/2 cup of milk and one large egg. Add this mixture to the dough and mix until smooth.

5. Knead the dough for five minutes until it becomes elastic and smooth.

6. Roll out the dough into a rectangle, about 6mm or 1/4 inch thick.

7. Mix the lemon zest with a little sugar and sprinkle evenly over the dough, leaving a 2.5cm or 1-inch border on one side.

8. Roll the dough into a tight log, starting from the opposite side of the border.

9. Cut the log into twenty-five equal pieces and shape each into a ball.

10. Place the balls onto the prepared baking sheet, leaving about 2.5cm or 1 inch of space between each bun.

11. Bake for fifteen to twenty minutes, or until the buns are golden brown.

12. While still warm, brush the tops with a little melted butter and sprinkle with pearl sugar.