Grandma’s Strawberry Rhubarb Crumble

Name: Grandma’s Strawberry Rhubarb Crumble
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Yield: 8 servings
Ingredients: 2 cups strawberries, hulled and sliced; 2 cups rhubarb, chopped; 3/4 cup sugar; 2 tablespoons cornstarch; 1 teaspoon vanilla extract; 1 tablespoon lemon juice; 1 cup all-purpose flour; 1 cup rolled oats; 1/2 cup brown sugar; 1/2 cup cold butter, cubed; 1/2 teaspoon cinnamon; 1/4 teaspoon salt

Highlighted under: Fruit Desserts

I absolutely adore the combination of tart rhubarb and sweet strawberries in my Grandma’s crumble recipe. It brings back memories of warm summer days spent in her garden, gathering fresh ingredients. With the buttery crumble topping adding the perfect texture, every bite is a delight. The best part is that it’s incredibly easy to prepare, making it a go-to dessert for family gatherings or cozy evenings at home. Trust me; this crumble will become a favorite in your household, just like it is in mine!

Created by

The Chefunacooks Team

Last updated on 2026-02-12T09:14:18.826Z

One of my fondest memories from childhood is helping my Grandma bake her famous strawberry rhubarb crumble. The way the sweet and tangy flavors meld together is simply magical. Every time I make this recipe, I am reminded of how easy it is to whip up a delicious dessert that tastes like it took hours to prepare. I love using fresh rhubarb and strawberries whenever possible, as they make all the difference in flavor.

To make the crumble topping extra crispy, I discovered that mixing in some oats elevates the texture nicely. It adds a lovely chewiness that complements the fruity filling perfectly. Don't skip the vanilla ice cream on the side – it’s the ideal accompaniment to this warm, comforting dessert!

Why You’ll Love This Recipe

The perfect balance of sweet strawberries and tart rhubarb.
A buttery crumble topping that adds a delightful crunch.
Simple and quick to prepare for any occasion.

Understanding the Ingredients

One of the standout ingredients in this crumble is rhubarb, which adds a refreshing tartness that beautifully contrasts with the sweetness of strawberries. When selecting rhubarb, look for firm, bright stalks with a vibrant color, as it indicates freshness. It's important to trim off any leaves, as they are toxic. This balance between sweet and tart is essential for achieving the signature flavor profile of Grandma’s crumble.

The use of cornstarch in the fruit filling is crucial for achieving the right consistency. It helps thicken the fruit juices as they cook, creating a luscious filling that holds together without becoming too watery. If you’re out of cornstarch, you can substitute it with an equal amount of all-purpose flour, but be prepared for a slightly different texture.

Perfecting the Crumble Topping

Achieving the ideal crumble topping requires cold butter. Make sure your butter is well-chilled; if you can, cut it into cubes and pop it back in the refrigerator for a few minutes before using. This prevents the butter from melting into the dry ingredients too quickly, allowing the topping to maintain its flaky texture during baking. When combining the butter with the dry mix, aim for a texture that resembles coarse crumbs—this is what gives the crumble its delightful crunch.

To add an extra layer of flavor, consider mixing in some chopped nuts or coconut flakes into the crumble mixture. This not only enhances the texture but also introduces a nutty element that complements the fruit beautifully. Adjust your baking time slightly if you add additional ingredients; keep an eye on the topping to ensure it doesn't brown too quickly.

Ingredients

For the Filling

2 cups strawberries, hulled and sliced
2 cups rhubarb, chopped
3/4 cup sugar
2 tablespoons cornstarch
1 teaspoon vanilla extract
1 tablespoon lemon juice

For the Crumble

1 cup all-purpose flour
1 cup rolled oats
1/2 cup brown sugar
1/2 cup cold butter, cubed
1/2 teaspoon cinnamon
1/4 teaspoon salt

Mix the filling ingredients in a bowl and then combine the crumble ingredients in another bowl, using a fork to blend until crumbly. Layer the filling in a baking dish and top it with the crumble before baking.

Instructions

Prepare the Filling

In a large bowl, combine the strawberries, rhubarb, sugar, cornstarch, vanilla extract, and lemon juice. Stir gently until everything is well mixed, then set aside.

Make the Crumble

In a separate bowl, mix together the flour, oats, brown sugar, cinnamon, and salt. Add the cold cubed butter and use a fork or your fingers to blend the mixture until it resembles coarse crumbs.

Assemble and Bake

Preheat your oven to 350°F (175°C). Pour the fruit filling into a greased 9-inch baking dish and spread it evenly. Sprinkle the crumble topping evenly over the fruit. Bake for 45 minutes or until the topping is golden brown and the filling is bubbling.

Cool and Serve

Remove the crumble from the oven and let it cool for about 10 minutes before serving. Enjoy warm, ideally with a scoop of vanilla ice cream!

Pro Tips

For added flavor, you can mix in some chopped nuts into the crumble topping. Experiment with different fruits, like blueberries or blackberries, to find your favorite combination.

Serving Suggestions

This Strawberry Rhubarb Crumble is at its best when served warm, right out of the oven. Top each serving with a generous scoop of vanilla ice cream, which contrasts the warm fruit filling beautifully. If you want to elevate the dish even further, a drizzle of caramel sauce or a sprinkle of powdered sugar adds a nice finishing touch.

For a different twist, serve it with a dollop of freshly whipped cream or Greek yogurt. The tanginess of the yogurt pairs excellently with the sweet and tart flavors of the crumble, giving it a lighter feel. It's a fantastic option for those looking for a less sweet topping.

Make-Ahead Tips

If you're planning to enjoy this crumble at a later date, good news: it can easily be made ahead of time. Prepare the fruit filling and the crumble topping separately, storing them in the refrigerator for up to a day. When you’re ready to bake, simply assemble and pop it into a preheated oven.

For longer storage, you can freeze the assembled but unbaked crumble. Wrap it tightly in plastic wrap and then in aluminum foil to prevent freezer burn. When you're ready to enjoy it, bake from frozen, adding about 10-15 minutes to the baking time, ensuring both the topping and filling reach that perfect golden brown and bubbly state.

Questions About Recipes

→ Can I use frozen rhubarb and strawberries?

Yes, you can use frozen fruit, but make sure to thaw and drain excess moisture to prevent a watery crumble.

→ How can I make the crumble gluten-free?

You can substitute the all-purpose flour with a gluten-free flour blend and ensure your oats are certified gluten-free.

→ Can I prepare this dessert ahead of time?

Absolutely! You can prepare the filling and crumble separately in advance and assemble just before baking.

→ What is the best way to store leftovers?

Store any leftovers in an airtight container in the refrigerator for up to three days. Reheat in the oven for the best texture.