Blueberry Lemon Muffins

Directions

1. Preheat the oven to 180 degrees celsius. Line the muffin tin with liners. I made parchment sheet muffin liners using the method from "The Kitchn."
2. In a large bowl, cream the butter and caster sugar until pale and fluffy. Add and beat one egg at a time.
3. Add the buttermilk, lemon juice and lemon zest. Sift in the flour and baking powder. Mix thoroughly. Fold in the blueberries into the batter.
4. Scoop 2 ice cream scoops of batter in the liners. Mix the granulated sugar and lemon zest, sprinkle this mixture on the batter. Bake for about 30 minutes.