Preheat oven to 190℃/375℉.
Put fruit into a baking dish. Add lemon juice and sugar and stir to make a syrup and coat the fruit.
Combine flour, sugar, salt and baking powder in a medium bowl.
Add milk and vanilla extract to the melted butter and stir to combine. Add wet ingredients to the dry ingredients. Lightly beat until smooth.
Dollop batter over the top of the fruit, ensuring it's covered.
Bake for 35 minutes until top is crispy and golden. When tapped with fingers it will feel firm but bouncy. Eat warm or at room temperature.