It's so easy and so good. Here is my classic crumble recipe:
Preheat the oven to 350F.
Clean, stem and cut up 4-5 cups of fruit (half strawberries half rhubarb) add 4 Tablespoons of flour (for thickened, in this instance because both strawberries and rhubarb are so lacking in pectin and juicy they need a little more than usual) and 1 cup of sugar. Toss the fruit with the flour and sugar and place in a baking dish (9 x 12 ish).
In a large bowl add 12 Tablespoons of unsalted butter, 1/2 teaspoon of salt, 1 cup ground pecans (or any other nuts you have on hand) 1 cup flour, 4 Tablespoons brown sugar, 2 tablespoons white sugar and 1/2 teaspoon cinnamon. Mix with your hands until everything is buttery and well incorporated then spread over prepared fruit.
Please adopt it as you see fit, in this version above I added about a 1/2 cup of rolled oats.
Bake for about 45 minutes in a 350F oven. You want to make sure the top is nicely browned and the fruit bubbling around the edges.
Completed covered and ready for the oven:
Great served with unsweetened whipped cream or ice cream!