Fruit Base

De-string the rhubarb and cut the stalks into about 20mm lengths, peel and dice the apple.
Mix the fruits and sugar together in a pan, adding about 1/3 cup water.
Cook until the fruits are soft.

Stir in some finely shaved chrystallized ginger at the last moment.

Allow to cool in the serving dish.

Cover with the crumble mix, and bake in a pre-heated oven for about 40 minutes at 190°C

Crumble Mix

Cut the butter into the mix of the flour, ground almonds, sugar and spices.
Rub together with your hands until it comes to bread crumb consistency.

Sprinkle over the finished fruit base.

Streusel mix recipe is after Viennese Cookery, Rosl Philpot, and the fruit part after a recipe in A Guide to Good Cooking, Five Roses Flour.