Rhubarb Crumble
Every garden on the road had a rhubarb patch, and every granny had a crumble. Ours came out whenever the stalks were long enough to pull — sharp pink rhubarb sweetened just enough, under a topping that was half pastry, half biscuit, and entirely fought over.
The secret to a topping that bakes crisp instead of soggy: keep the butter cold, leave some pebbly lumps when you rub it in, and never press the crumble down — scatter it loose so the heat can get through. A spoon of cornflour in the fruit thickens those sherbet-pink juices into something you'll want to drink.
Custard is not optional in this house. Pour it hot, and pass the jug twice.
Rhubarb Crumble
Sharp garden rhubarb under a buttery, golden oat topping — crisp on top, bubbling underneath.
Ingredients
For the fruit
- 600 g rhubarb, in 3 cm pieces
- 100 g caster sugar
- 1 tbsp cornflour
- Zest & juice of ½ orange
For the crumble
- 175 g plain flour
- 110 g cold butter, cubed
- 85 g demerara sugar
- 40 g porridge oats
- Pinch of salt · custard, to serve
Method
- Heat the oven. Preheat to 190°C (fan 170°C / gas 5).
- Prepare the fruit. Toss the rhubarb with the caster sugar, cornflour, orange zest and juice. Tip into a baking dish in an even layer.
- Make the crumble. Rub the cold butter into the flour and salt until it looks like coarse breadcrumbs with some pebbly lumps, then stir in the demerara and oats.
- Top loosely. Scatter the crumble evenly over the fruit — don't press it down. Loose topping = crisp topping.
- Bake. 35–40 minutes until deep golden and bubbling pink at the edges. Rest 10 minutes, then serve warm with plenty of hot custard.
Make a double batch of topping and freeze half in a bag — instant crumble any night you have fruit going soft in the bowl.
Tips for a crisp crumble
Cold butter, lumpy rub
Stop rubbing while there are still pea-sized lumps — they melt into crisp, biscuity clusters.
Scatter, never press
Pressed crumble steams and turns to paste. Loose crumble lets heat through and crisps up.
Thicken the juices
A spoon of cornflour turns thin rhubarb juice into a glossy, spoonable sauce.
Questions, answered
Can I use frozen rhubarb?
Yes — use it straight from frozen and add an extra teaspoon of cornflour to soak up the extra juice. Don't thaw it first or it turns mushy.
Why is my crumble topping soggy?
Usually the butter was too warm, the topping was pressed down, or the fruit was too wet. Keep the butter cold, scatter the topping loosely, and use the cornflour to thicken the juices.
What other fruit works with this topping?
It's a universal crumble topping: try Bramley apples, plums, gooseberries — or rhubarb mixed half-and-half with strawberries in summer.