Wash the fruit. Halve the nectarines and plums and remove the stones. Peel and quarter the pears or apples and remove the core. Then cut into cubes. Cut the leaf from the rhubarb and wash the rhubarb stick well and cut into small pieces.
Use the pastry brush to grease the casserole dish with the margarine and preheat the oven to 175 ° C.
Pour the fruit into the baking dish and smooth it out with a spoon.
Mix the sugar and lemon juice in a cup and pour over the fruit.
Cut the butter / margarine into small pieces and place in a bowl, add sugar and flour. Knead the mixture until you get crumble, then spread it over the fruit. Place the baking dish in the oven for about 30 minutes until the crumble is golden brown.