Traditional Rhubarb Crisp With Frozen Rhubarb

Name: Traditional Rhubarb Crisp With Frozen Rhubarb
Prep time: 15 min
Cook time: 45 min
Total time: 60 min
Ingredients: 6 cups Frozen Rhubarb; 1 cup Granulated Sugar; 3 tablespoons Cornstarch; 1 teaspoon Vanilla Extract; 1 cup All-purpose Flour; 1 cup Old-fashioned Rolled Oats; 1 cup Brown Sugar; 1 teaspoon Ground Cinnamon; 1/2 cup Unsalted Butter

This Traditional Rhubarb Crisp With Frozen Rhubarb is the ultimate comfort dessert that brings the bright, tart flavors of spring to your table any time of year. With a buttery, golden oat topping and a jammy fruit filling, it is a simple yet impressive treat that everyone will love.

Why You Will Love This Recipe

You will love this recipe because it is incredibly convenient, allowing you to use frozen rhubarb straight from your freezer without losing that signature tangy flavor. The contrast between the softened, tart stalks and the crunchy, sweet crumble topping creates a perfect balance in every bite. Plus, it is a budget-friendly dessert that requires only basic pantry staples and very little active prep time.

Ingredients

4 to 5 cups frozen rhubarb, sliced into 1-inch pieces
3/4 cup granulated sugar
2 tablespoons cornstarch (to help thicken the juices)
1 teaspoon vanilla extract
1 cup old-fashioned rolled oats
1 cup all-purpose flour
1 cup packed light brown sugar
1/2 cup unsalted butter, cold and cubed
1 teaspoon ground cinnamon
1/4 teaspoon salt

Step-by-Step Instructions

Preheat your oven to 375°F (190°C) and lightly grease a 9×9 inch baking dish or a 2-quart casserole dish with butter or non-stick spray.
In a large mixing bowl, toss the frozen rhubarb with the granulated sugar, cornstarch, and vanilla extract until the pieces are evenly coated.
Pour the rhubarb mixture into the prepared baking dish, spreading it out into an even layer.
In a separate medium bowl, combine the rolled oats, all-purpose flour, brown sugar, cinnamon, and salt.
Add the cold, cubed butter to the oat mixture. Use a pastry cutter or your fingers to work the butter into the dry ingredients until the mixture resembles coarse crumbs.
Sprinkle the crumble topping evenly over the rhubarb filling, ensuring it covers the fruit completely.
Bake in the preheated oven for 40 to 45 minutes, or until the fruit is bubbling and the topping is a deep golden brown.
Remove from the oven and let the crisp cool for at least 15 minutes before serving to allow the juices to set.

Expert Tips / Pro Tips

For the best results with frozen rhubarb, do not fully thaw the fruit before baking. Allowing it to partially thaw for about 10-15 minutes helps the sugar and cornstarch stick, but keeping it mostly frozen prevents it from becoming too mushy. If your frozen rhubarb has a lot of ice crystals, give it a quick rinse in a colander and pat it dry before mixing. Always use cold butter for the topping; this ensures you get those delicious crunchy clusters rather than a flat, greasy crust.

Variations & Substitutions

If you want to mix things up, you can replace two cups of the rhubarb with frozen strawberries to make a classic Strawberry Rhubarb Crisp. For a gluten-free version, simply use a 1:1 gluten-free flour blend and certified gluten-free oats. You can also add a half-cup of chopped pecans or walnuts to the topping for extra crunch. If you prefer a deeper flavor, try using dark brown sugar instead of light brown sugar in the crumble.

Serving Suggestions

This Traditional Rhubarb Crisp With Frozen Rhubarb is best served warm. A large scoop of high-quality vanilla bean ice cream is the classic accompaniment, as the cold creaminess cuts through the tartness of the rhubarb. Alternatively, a dollop of homemade whipped cream or a drizzle of heavy cream works beautifully. For a breakfast twist, try a small serving with a spoonful of Greek yogurt.

Storage, Freezing & Reheating

Store any leftover crisp in an airtight container in the refrigerator for up to 4 days. To maintain the crunch of the topping, it is best to reheat it in the oven at 350°F for about 10 minutes. If you are in a hurry, the microwave works fine, though the topping will soften. You can also freeze the baked crisp for up to 3 months; thaw it in the fridge overnight before reheating in the oven to restore its texture.

Nutrition Information

Nutrient	Amount Per Serving
Calories	345 kcal
Total Fat	12g
Saturated Fat	7g
Cholesterol	30mg
Sodium	65mg
Total Carbohydrates	58g
Dietary Fiber	3g
Sugars	38g
Protein	3g

FAQ

Do I need to thaw the rhubarb before baking?

No, you do not need to fully thaw the rhubarb. In fact, baking it from frozen or partially frozen helps maintain the structure of the fruit so it doesn’t turn into a puree.

Can I use fresh rhubarb instead of frozen?

Yes, this recipe works perfectly with fresh rhubarb. Simply follow the same measurements and instructions. The baking time may be slightly shorter (around 35-40 minutes).

Why is my rhubarb crisp watery?

Rhubarb releases a lot of moisture as it cooks. If your crisp is too watery, ensure you added the cornstarch as directed, as it acts as a thickening agent for the fruit juices.

Can I make the topping in advance?

Absolutely! You can mix the dry ingredients and butter together and store the crumble in a sealed bag in the freezer for up to a month. Just sprinkle it over the fruit when you are ready to bake.

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