Filling
Place Cardamom Lemon Sugar, rhubarb, apple, zest and juice into the Thermomix bowl and cook 8 min/100°C/Reverse/speed 1.
Pour into ovenproof dish (or individual dishes) and top evenly with sliced strawberries.
Crumble
In clean, dry Thermomix bowl, place Cardamom Lemon Sugar, salt and butter and mix 4 sec/speed 5.
Add remaining ingredients except pistachios and blend 4 sec/Reverse/speed 5. Add pistachios and blend 3 sec/Reverse/speed 5.
Place crumble on top of filling, spreading to fill gaps. Bake for 40–50 minutes until golden and fragrant. A little of the filling juice should burst through the crumble and caramelise.
Serve piping hot with custard, cream, vanilla bean ice-cream, mascarpone or all of the above!