Melt the butter

• Place the butter in the baking dish.
• Put the dish in the oven at 230 °C and let the butter melt.

Mix the biscuit dough

• Combine the self-rising flour, sugar, lemon zest and vanilla extract in a bowl.
• Pour in the buttermilk and mix until a sticky dough forms, without overworking it.
• Gently fold in the blueberries.

Bake the biscuits

• Pour the dough over the melted butter in the hot dish and smooth it out.
• Cut the dough into portions with a knife.
• Bake at 230 °C for 25 minutes.

Make the icing

• Mix the powdered sugar, lemon juice and milk until smooth.

Ice and serve

• Let the biscuits cool for a moment.
• Pour the icing over the warm biscuits so it melts in.
• Add extra icing after serving if desired.