Heat oven to about 180°C - 200°C.
In a large bowl, mix flour with sugar and salt and rub the butter into the flour until it resembles fine breadcrumbs. Mix vanilla essence with the milk and add, making sure to keep using your finger tips.
Sprinkle some lemon juice on the diced fruit to prevent discolouration.
Add the 4 tablespoons of sugar, cinnamon, a pinch of salt and about 3 tablespoons of water to the fruit. Cook for 5 minutes. Leave to cool.
Arrange fruit in a baking dish and sprinkle crumble over the top. Grab some of the crumble and squeeze lightly together to form larger chunks and leave the others small. This forms a nice looking top with varying sizes of the crumble.
Bake for about 35 minutes or until the crumble is golden brown.
Serve warm with ice cream or custard.