If you’re craving a delicious and refreshing dessert, This recipe for rhubarb custard bars for summer is perfect for a warm day. Combining the tartness of fresh rhubarb with a creamy custard and buttery crust, these bars make a perfect sweet treat on warm days. Whether you’re hosting a picnic, a family gathering, or simply want to enjoy a seasonal delight, this easy-to-make recipe will quickly become your go-to dessert.
There’s something truly magical about summer desserts, especially those that strike the perfect balance between sweet and tangy. If you’re looking for a treat that’s not only delicious but also simple enough to whip up on a warm afternoon, you’ve just found it. Rhubarb custard bars bring together the crisp, refreshing tartness of rhubarb with a smooth, creamy custard nestled on a buttery crust. This dessert is perfect for your next picnic, family gathering, or whenever you want to treat yourself to something homemade and delightful.
Imagine biting into a bar where the vibrant flavors of summer come alive — that’s exactly what these rhubarb custard bars deliver. And the best part? You don’t need to be a baking expert to make them. In this guide, you’ll learn everything about crafting these quick and simple rhubarb custard bars that will wow your friends, family, and most importantly, your own taste buds.
Why Rhubarb Custard Bars Are the Perfect Summer Treat

You might wonder why rhubarb custard bars deserve a spot in your summer recipe collection. The answer lies in the unique qualities of rhubarb and the luscious custard that complements it.
Seasonal Freshness and Nutritional Benefits
Rhubarb is a seasonal vegetable that shines in spring and summer. Its bright pink stalks add a splash of color and a burst of tartness that pairs beautifully with sweeter ingredients. Beyond its appealing flavor, rhubarb is a good source of antioxidants and vitamins, including vitamin K and C, making your dessert a little healthier without sacrificing taste.
The Ideal Combination of Texture and Flavor
What makes rhubarb custard bars stand out is their delightful texture contrast. The buttery crust offers a slight crunch, while the custard filling remains silky and smooth. The rhubarb pieces lend a refreshing tartness that balances the sweetness perfectly, resulting in a dessert that feels light enough for summer but indulgent enough to satisfy your sweet cravings.
Simple Enough for All Skill Levels
Whether you’re a beginner baker or a seasoned pro, this recipe is forgiving and straightforward. The steps are easy to follow, and the ingredients are common, so you can make this dessert without any hassle. It’s a recipe that anyone can master, and once you do, it becomes a summer staple in your kitchen.
Ingredients for Quick and Simple Rhubarb Custard Bars

Before diving into the preparation, let’s gather all the essentials. Using fresh, high-quality ingredients will elevate your bars to the next level.
Ingredient | Quantity | Notes |
---|---|---|
Fresh rhubarb | 3 cups, chopped | Use firm, bright stalks for best flavor |
All-purpose flour | 2 cups | Needed for the crust and topping |
Granulated sugar | 1 ½ cups | Divided between crust and custard |
Unsalted butter | ¾ cup (cold) | Chilled, for a flaky crust |
Large eggs | 4 | For a creamy custard filling |
Vanilla extract | 1 teaspoon | Adds depth to custard flavor |
Salt | ¼ teaspoon | Enhances sweetness |
Baking powder | 1 teaspoon | Helps crust rise slightly |
Pro Tip: If you want a gluten-free version, you can swap all-purpose flour with a gluten-free baking blend, but expect a slightly different texture.
Step-by-Step Guide to Making Rhubarb Custard Bars
Now, let’s walk through the process together. By following these clear steps, you’ll achieve a beautiful, tasty dessert every time.
Preparing the Crust
- Mix dry ingredients: In a large bowl, combine the all-purpose flour, baking powder, salt, and half of the sugar.
- Cut in the butter: Using a pastry cutter or your fingers, blend the cold, cubed butter into the flour mixture until it resembles coarse crumbs.
- Press into pan: Firmly press this mixture into a greased or parchment-lined 9×13 inch baking pan, creating an even layer.
- Pre-bake the crust: Bake at 350°F (175°C) for about 15 minutes, until it starts to turn golden but is not fully cooked. This step helps the crust stay crisp under the custard.
Making the Custard Filling
- Beat the eggs: In a separate bowl, whisk the eggs and remaining sugar until smooth and slightly frothy.
- Add vanilla: Stir in the vanilla extract for extra flavor.
- Fold in rhubarb: Gently fold the chopped rhubarb into the egg mixture, making sure they’re evenly coated but not overly mashed.
Assembling and Baking
- Pour custard over crust: Once the crust has cooled slightly after pre-baking, pour the custard mixture evenly over it.
- Bake: Place the pan back in the oven and bake for 40-45 minutes, or until the custard is set and the edges begin to pull away slightly from the pan.
- Cooling: Let the bars cool completely on a wire rack. For best texture, refrigerate for at least 2 hours before slicing.
Helpful Tip: Using parchment paper helps you remove the bars cleanly and easily without them falling apart.

Tips for Serving and Storing Rhubarb Custard Bars
Your freshly baked bars are ready — now what?
Serving Suggestions
- Serve the bars chilled or at room temperature depending on your preference.
- Add a dollop of freshly whipped cream or a scoop of vanilla ice cream to enhance the indulgence.
- Garnish with fresh mint leaves or extra rhubarb pieces for a pretty presentation.
Storing Your Bars
- Store leftovers in an airtight container in the refrigerator. They stay fresh for up to 4 days.
- You can also freeze the bars: wrap them tightly in plastic wrap and foil. Thaw overnight in the fridge before serving.

Variations to Try for Your Rhubarb Custard Bars
Feel free to customize the bars to suit your taste or occasion. Here are some tasty ideas:
- Streusel topping: Add a crumbly oat and brown sugar streusel for added texture and sweetness.
- Berry blend: Mix in fresh strawberries or raspberries with the rhubarb for a fruitier flavor.
- Citrus twist: Add a teaspoon of lemon zest to the custard for an uplifting brightness.
- Mini bars: Bake in a muffin tin for single-serving portions, perfect for parties or picnics.
FAQ – Quick and Simple Rhubarb Custard Bars Recipe
Q1: Can I use frozen rhubarb instead of fresh?
A1: Yes, but make sure to thaw and drain it well to avoid excess moisture, which can make the crust soggy.
Q2: How do I know when the custard is done baking?
A2: The edges should be set and slightly pulling away from the pan. The center should jiggle a bit but not be liquid.
Q3: Can I substitute butter with margarine or oil?
A3: Butter provides the best flavor and texture, but you can use margarine in a pinch. Oil is not recommended as it affects the crust’s structure.
Q4: Is it possible to make this recipe vegan?
A4: You can try substituting eggs with flax eggs and use a plant-based butter alternative, but the custard texture will differ.
Q5: How should I store leftovers?
A5: Keep them refrigerated in an airtight container for up to 4 days. Freeze if you want to store longer.
Conclusion
Now that you have everything you need to make these easy and refreshing rhubarb custard bars, why not gather your ingredients and get started today? This recipe is a wonderful way to enjoy a taste of summer with minimal effort and maximum reward. Not only will you delight your family and friends, but you’ll also discover the joy of baking a classic dessert that’s both nostalgic and fresh.
Once you’ve tried it, don’t forget to share your creations or any fun twists you add to the recipe. Whether it’s your first time or you’re a seasoned baker, these rhubarb custard bars are sure to become one of your favorites.