Place butter in an 8x8" pan and place in a 350 degree oven to melt.
Combine flour, sugar, baking powder and salt in a bowl. Combine milk and lemon juice and pour into the flour mixutre. Stir lightly until no dry spots remain. Remove pan from oven once butter has melted and pour the batter into the melted butter. Do not stir.
Arrange berries on top of batter, continuing to be careful not to stir the butter into the batter. Top with the turbinado sugar.
Bake 40-50 minutes until the top is golden and the berries are bubbling from the top. Serve warm with whipped cream or ice cream.