What better time to make a fruit crumble than when the fruits are all in season. Served warm is always the best with a fresh crumble!
Preheat oven to 350F.
Grease a medium size oven proof dish with a little butter.
Place the plums, raspberries and sugar into a small saucepan with the water and simmer for 5 minutes to soften the fruit.
Shut off and set aside.
Place the flour and sugar into a small mixing bowl.
Add the butter and stir in with a wooden spoon, then use your fingertips to rub together and form a crumble.
Transfer the fruit into the baking dish.
Top with the crumble.
Place into the preheated oven and bake for 20 minutes or until golden brown.
Remove to a cooling rack.
Serve warm or cooled.