My very favourite way to eat rhubarb. In this recipe I use hazelnuts in the crumble, you can use other nuts such as cobnuts and almonds or a mixture of nuts. To prepare the rhubarb you need to remove the leaves (these are poisonous) and cut off the brown bottom part of the stem, rinse them and if they are thick, string them (forced and thin rhubarb doesn't need to be stringed).