Does rhubarb custard cake need to be refrigerated?

Yes, always refrigerate this cake because the eggs and heavy cream in the custard layer spoil at room temperature after 2 hours. Chilling also firms up the custard so slices hold their shape. Keep it covered in the fridge for up to 4 days.

How long does rhubarb custard cake last?

It stays fresh for up to 4 days when covered tightly in the refrigerator. The custard layer actually gets silkier overnight. After 4 days, discard any leftovers for food safety.

Can you freeze rhubarb custard cake?

Definitely. Cool it completely, wrap slices or the whole cake in plastic wrap then foil, and freeze for up to 3 months. Thaw overnight in the fridge. The custard layer holds its smooth texture, so this works as a great make-ahead dessert.

Is fresh or frozen rhubarb best for rhubarb custard cake?

Fresh rhubarb stalks give the brightest, firmest bite, but frozen works well if thawed and drained thoroughly. I've used both. The real difference: extra liquid from frozen fruit can thin the custard, so press it dry with paper towels before using.

What are the common mistakes when making rhubarb cake?

Pressing the rhubarb down is a big one. Let it sit on top so the heavy cream can sink properly. Another mistake is mixing the batter with a stand mixer, which makes it gummy. Also, skipping the sugar-dusted pan means you miss that delicate caramelized crust.

Do I need to cook rhubarb before putting it in a cake?

No, never precook it. Raw chopped rhubarb softens into jammy ribbons during the 45–60 minute bake time. The dump cake method relies on the oven's heat to break it down, and pre-cooking would make the fruit mushy and release too much liquid.

When is the best time to serve rhubarb custard cake?

Serve it after at least 4 hours of refrigeration. Overnight is even better. The custard layer sets firm, making slicing clean. It's especially nice chilled with a dollop of whipped cream topping and a few thin fresh rhubarb slices for a bit of crunch.

Rhubarb Custard Cake: 6-Ingredient Easy Dump Cake Recipe

Description

A 6-ingredient rhubarb custard cake made with yellow cake mix and a dump cake method. Heavy cream poured over the batter sinks during baking to form a creamy custard layer beneath tart rhubarb. A sugar-dusted pan creates a delicate caramelized crust.

Ingredients

Scale

1 box (15.25 oz) yellow cake mix

3 cups chopped fresh rhubarb stalks (or frozen, thawed and drained)

1 1/2 cups heavy cream

1 cup granulated sugar, plus extra for dusting pan

1/2 cup unsalted butter, softened to room temperature

2 large eggs, at room temperature

1 teaspoon vanilla extract

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Instructions

1. Preheat oven to 350°F. Butter a 9-inch springform pan generously, then dust with granulated sugar, tapping out excess.

2. In a large bowl, whisk together yellow cake mix, softened butter, eggs, granulated sugar, and vanilla extract until thick and smooth, about 30 seconds.

3. Scrape batter into prepared pan and spread into an even layer.

4. Scatter chopped rhubarb evenly over the batter. Do not press down.

5. Slowly pour heavy cream over the entire surface, letting it pool in gaps between rhubarb pieces.

6. Bake for 45-60 minutes until top is deeply golden brown and center no longer jiggles. An instant-read thermometer inserted into custard should read about 200°F.

7. Cool in pan for 5 minutes, then run a knife around edge before releasing springform.

8. Cool completely at room temperature, then refrigerate for at least 4 hours or overnight before slicing.

9. Dust with powdered sugar and serve chilled with whipped cream topping if desired.

Notes

Store in the refrigerator for up to 4 days or freezer for up to 3 months. Reheat at 300°F for 10 minutes.

If using frozen rhubarb, thaw completely and press out all liquid with paper towels to prevent a watery custard layer.

Resist stirring after adding cream, the dump cake method depends on leaving layers undisturbed so the custard forms properly.

For best texture, refrigerate custard cake overnight. The custard layer firms up and slices cleanly.

Room temperature butter and eggs blend more smoothly; cold ingredients can make the batter lumpy.

Prep Time: 10 min
Rest Time: 5 min
Cook Time: 45 min
Category: Dessert
Method: Baking
Cuisine: American

Nutrition

Serving Size: 1 slice
Calories: 310 kcal
Sugar: 28 g
Sodium: 280 mg
Fat: 16 g
Saturated Fat: 10 g
Unsaturated Fat: 6 g
Trans Fat: 0 g
Carbohydrates: 38 g
Fiber: 1 g
Protein: 4 g
Cholesterol: 75 mg