Ingredients
Method
- Roast rhubarb with sugar and orange zest at 200°C / 180°C fan / Gas 6 for 15 minutes. Drain liquid.
- Thicken drained liquid with cornflour paste, pour back over rhubarb.
- Rub cold butter into flour and salt until coarse crumbs. Stir in sugar and oats.
- Chill crumble topping 15 minutes.
- Reduce oven to 180°C / 160°C fan / Gas 4.
- Scatter topping over rhubarb without pressing down.
- Bake 30–35 minutes until golden and bubbling.
- Rest 5 minutes before serving.
Notes
Roasting the rhubarb first prevents a soggy base — don't skip this step.
Rub the topping by hand for a coarser, crisper texture.
Chilling the topping before baking improves the final crunch.
Freezes well, baked, for up to 3 months.
