Easy Old Fashioned Rhubarb Custard Pie

The first time I made rhubarb custard pie, I honestly thought I ruined it. The center still looked slightly wobbly when I pulled it from the oven, and I was convinced the filling would collapse into soup once I sliced it.

Turns out, that little wobble is exactly what you want.

My grandma used to make rhubarb desserts every spring because rhubarb grew like weeds behind her house. Most of the time it ended up in crisps or jam, but this pie was the one everyone waited for. Sweet custard, tart rhubarb, flaky crust. Simple, old-school, and somehow better than a lot of fancy bakery desserts.

Here’s the thing with rhubarb custard pie: balance matters. Too much sugar and the rhubarb disappears. Too little and the pie tastes sharp enough to make your jaw tighten. What finally worked for me was keeping the custard rich but not overly heavy so the rhubarb still stands out.

I use a store-bought pie crust sometimes, especially if I’m making this on a weekday and don’t feel like dealing with homemade dough. Nobody has ever complained.

The filling comes together fast. Eggs, sugar, flour, cream, and salt get whisked until smooth, then the chopped rhubarb gets folded in. It looks very liquid before baking, almost suspiciously thin, but it sets beautifully in the oven.

How to Make It

I start by preheating the oven and placing the pie shell onto a baking sheet because custard pies are notorious for dripping if you overfill them. Learned that after cleaning burnt custard off the bottom of my oven once.

The rhubarb gets chopped into small pieces so it softens evenly while baking. Bigger chunks stay stringy sometimes, especially near the center.

For the custard, I whisk eggs, sugar, flour, salt, and heavy cream together until smooth. No mixer needed. Then I stir in the rhubarb and pour everything into the unbaked pie shell.

The pie bakes until the edges are set and the middle still has the slightest jiggle. The top turns lightly golden, and you’ll smell warm vanilla-like custard mixed with tart fruit even though there’s no vanilla in the filling.

Cooling matters more than people think. If you cut into it too early, the custard won’t fully hold together. I usually let it cool for at least a couple of hours before slicing.

Things I Learned the Hard Way

Don’t overbake this pie trying to get the center completely firm in the oven. It keeps setting as it cools.

Also, put the pie on a baking sheet before filling it. Carrying a full custard pie across the kitchen without spilling is harder than it sounds.

And if your rhubarb is extra tart, you can sprinkle a little extra sugar on top before baking. I’ve had some batches of rhubarb that were much sharper than others.

Storage & Serving

This pie keeps well in the refrigerator for about 3 days because of the custard filling. I actually like it cold straight from the fridge the next morning with coffee. Some people add whipped cream, but honestly I usually leave it plain.

Lyna Recipes

Easy Old Fashioned Rhubarb Custard Pie

A classic rhubarb custard pie with flaky crust, creamy egg custard filling, and tart rhubarb baked until perfectly set.

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Prep Time 15 minutes mins

Cook Time 50 minutes mins

Total Time 1 hour hr 5 minutes mins

Servings: 8 slices

Ingredients Method Notes

Ingredients

  

• 1 unbaked pie shell
• 3 cups rhubarb chopped
• 3 eggs
• 1 1/4 cups granulated sugar
• 3 tbsp all-purpose flour
• 1/2 tsp salt
• 1 cup heavy whipping cream

Method

 

1. Preheat oven to 375°F (190°C). Place unbaked pie shell onto a baking sheet.
2. Spread chopped rhubarb evenly into the pie shell.
3. In a large bowl, whisk eggs, sugar, flour, salt, and heavy cream until smooth.
4. Pour custard mixture over rhubarb in pie shell.
5. Bake 45–50 minutes until edges are set and center is slightly jiggly.
6. Cool completely before slicing and serving.

Notes

Let the pie cool fully so the custard can finish setting. Store leftovers covered in the refrigerator for up to 3 days. If the crust browns too quickly, loosely cover edges with foil during baking.