So, in researching around 15 recipes, I kind of came up with my own based on all of these varying crumble recipes, and here it is!...
800g stewed fruit - 3 large apples and a big handful of rhubarb stalks to equal 800g - the balance of which is your choice!
100g granulated sugar
1 tbsp water
200g plain flour
80g ground almonds
170g unsalted butter, chilled and cut into chunks
100g golden caster sugar
Pinch of salt
1. Peel, core and cut the apples into small chunks. Cut the rhubarb into equal sized pieces.