Rhubarb Raspberry Crumble
This Rhubarb Raspberry Crumble is the ultimate summer dessert, bursting with tangy rhubarb and sweet raspberries beneath a buttery, golden oat topping. Ready in under an hour and impossible to resist.
The Summer Dessert You'll Make on Repeat
There is something deeply comforting about a fruit crumble fresh from the oven. The bubbling, jewel-toned fruit. The shatteringly crisp, buttery topping. That first spoonful with a scoop of vanilla ice cream melting into the warm juices. This Rhubarb Raspberry Crumble is exactly that kind of dessert, the kind that makes a kitchen smell incredible and a dinner table go quiet.
Rhubarb and raspberry are one of the great underrated pairings in baking. The rhubarb brings a sharp, almost floral tartness that keeps the dessert from being cloying, while the raspberries add a jammy sweetness and gorgeous colour. Together, under a spiced oat crumble, they are simply perfect.
Best of all, this recipe is genuinely easy. No pastry to roll, no special technique required. If you can mix two bowls and use your fingertips, you can make this.
Why This Crumble Works So Well
A lot of crumble recipes end up with a topping that turns soggy as it sits or a filling that runs like soup. A couple of small details here make all the difference:
- Cold butter, worked quickly. Warm butter melts into the oats and creates a dense, greasy layer. Cold butter steams as it bakes, creating those irresistible craggy, crispy clusters.
- Cornstarch in the filling. Just one tablespoon thickens the rhubarb juices into a glossy, luscious sauce rather than a watery puddle.
- A rest before serving. Pulling the crumble from the oven and letting it sit for 10 minutes is tempting to skip, but the filling continues to thicken as it cools slightly. It's worth the wait.
Chef's Tip: For extra crunch and a nutty flavour, stir a small handful of chopped pecans or flaked almonds into the crumble topping before baking.
The Right Tools Make the Difference
For a crumble this simple, the quality of your baking dish and the freshness of your fruit genuinely determine the outcome. A good ceramic or glass baking dish distributes heat evenly and lets you see when the fruit is truly bubbling. Fresh, in-season rhubarb will be tender and tart in a way that jarred or overripe stalks simply cannot match.
Tools & Ingredients We Recommend
Rhubarb Season and Sourcing
If you're lucky enough to have rhubarb growing in your garden, this is the recipe to make with it. Peak rhubarb season runs from late spring through midsummer. Look for firm stalks that are vibrantly coloured, anywhere from pale green to deep crimson. The colour doesn't affect the flavour much, but brighter stalks tend to be younger and more tender.
For raspberries, fresh is always wonderful, but frozen raspberries are a perfectly solid choice here. Because the berries are baked, you lose nothing meaningful in texture, and frozen fruit is often picked and frozen at peak ripeness, making it reliably sweet and flavourful year-round.
Serving Suggestions
This crumble is best served warm, ideally within 20 to 30 minutes of coming out of the oven. Classic pairings include:
- Vanilla ice cream for that hot-and-cold contrast
- Thick clotted cream for a proper British finish
- Lightly sweetened whipped cream for something lighter
- A drizzle of custard if you want to go the full comfort-food route
It also reheats beautifully the next day, making it an excellent make-ahead dessert for dinner parties.
Ready to get baking? Here is the full recipe:
Rhubarb Raspberry Crumble
This Rhubarb Raspberry Crumble is the ultimate summer dessert, bursting with tangy rhubarb and sweet raspberries beneath a buttery, golden oat topping. Ready in under an hour and impossible to resist.
Ingredients
- 4 rhubarb stalks, trimmed and cut into 1-inch pieces
- 1 1/2 cups fresh raspberries, frozen works too, no need to thaw
- 3/8 cup granulated sugar, for the fruit filling
- 1 tbsp cornstarch
- 1 tsp vanilla extract, pure, not imitation
- 1 cup rolled oats, old-fashioned, not instant
- 1/2 cup all-purpose flour
- 1/2 cup brown sugar, packed
- 1/2 tsp ground cinnamon
- 1/4 tsp ground ginger
- 6 tbsp unsalted butter, cold, cut into small cubes
- 1 pinch pinch of salt
Instruction
Preheat your oven to 375 degrees F (190 degrees C). Lightly butter a 9-inch baking dish or equivalent-sized oven-safe dish.
In a large bowl, toss together the rhubarb pieces, raspberries, granulated sugar, cornstarch, and vanilla extract until the fruit is evenly coated. Pour the fruit mixture into the prepared baking dish and spread into an even layer.
In a separate bowl, combine the rolled oats, flour, brown sugar, cinnamon, ginger, and salt. Add the cold cubed butter and use your fingertips to rub it into the dry ingredients until the mixture resembles coarse, clumpy breadcrumbs with some pea-sized pieces remaining. Do not overwork it.
Scatter the crumble topping evenly over the fruit filling, covering it all the way to the edges.
Bake for 35 to 40 minutes, until the topping is deep golden brown and the fruit juices are visibly bubbling up around the edges.
Remove from the oven and let the crumble rest for at least 10 minutes before serving. This allows the juices to thicken slightly. Serve warm with vanilla ice cream or clotted cream.
Equipment
- 9-inch baking dish
- Large mixing bowl
- Medium mixing bowl
- Pastry cutter or fingertips
- Knife and cutting board
- Measuring cups and spoons
Notes
Storing and Making Ahead
One of the best things about this crumble is how well it fits into a busy schedule. You can assemble the entire dish the day before, cover it tightly, and refrigerate it unbaked overnight. When you're ready, pop it straight into a preheated oven and add about 5 minutes to the bake time.
Leftovers keep in the refrigerator for up to 3 days. Reheat portions in a 350 degree oven for 10 minutes to bring the topping back to life, or use the microwave for a quicker, softer result. Either way, it tastes just as good the next day.
