Blueberry upside down cake

Mix together flour, sugar, lemon peel, baking powder, sodium bicarbonate, vanilla extract, eggs, milk, salt and melted butter.

• flour: 340 g
• sugar: 120 g
• lemon peel: 1
• baking powder: 2 tsp
• sodium bicarbonate: ¼ tsp
• vanilla extract: 2 tsp
• eggs: 2
• milk: 140 ml
• salt: 1 pinch
• melted butter: 170 g

Toss blueberries with sugar and lemon juice

• blueberries
• sugar: ¼ cup
• lemon juice: 1

Place parchment paper on the bottom of a cast iron skillet. Place blueberries into skillet, then pour the stuff on top. Place in oven on 180 C for 45 minutes .