Embrace the vibrant flavors of spring with these Quick Vegan Rhubarb Custard Bars. Imagine a golden, crumbly shortbread crust providing the perfect foundation for a luscious, creamy, plant-based custard, generously studded with tender, tart rhubarb. This recipe solves the craving for a delightful, seasonal dessert that’s entirely vegan, surprisingly easy to make, and perfect for sharing or enjoying as a satisfying treat throughout the week. If you’ve ever loved the classic tangy-sweet combination of rhubarb and custard but follow a plant-based diet, these bars are your dream come true. They offer a beautiful balance of textures – the slight chewiness of the rhubarb, the silky smoothness of the custard, and the satisfying crispness of the crust – all harmonizing in a symphony of sweet and tart notes. The bright pink hues of the rhubarb peeking through the creamy yellow custard make these bars as visually appealing as they are delicious. They’re a fantastic way to celebrate the arrival of fresh rhubarb, transforming it into a portable, crowd-pleasing dessert or a delightful afternoon snack. Get ready to fall in love with a vegan treat that’s both comforting and refreshingly vibrant.
Recipe Info:
Prep Time: 25 minutes
Cook Time: 40 minutes
Total Time: 1 hour 5 minutes
Yield: 16 bars
Ingredients
For the Shortbread Crust:
- 1 ½ cups (180g) all-purpose flour
- ¼ cup (50g) granulated sugar
- ½ teaspoon salt
- ½ cup (113g) cold vegan butter, cut into cubes
For the Rhubarb Custard Filling:
- 1 ½ cups (about 250g) fresh rhubarb, trimmed and cut into ½-inch pieces
- ¾ cup (150g) granulated sugar
- ¼ cup (30g) cornstarch
- ¼ teaspoon salt
- 1 ½ cups (360ml) full-fat canned coconut milk (refrigerated overnight, use only the thick cream)
- ¼ cup (60ml) fresh lemon juice
- 1 teaspoon vanilla extract
- ½ teaspoon ground turmeric (for color, optional)
Step-by-Step Instructions
- Prepare the Crust: Preheat your oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper, leaving an overhang on two sides to easily lift the bars later.
- In a large bowl, whisk together the flour, sugar, and salt for the crust. Add the cold cubed vegan butter. Using a pastry blender, your fingertips, or a food processor, cut the butter into the flour mixture until it resembles coarse crumbs with some pea-sized pieces remaining.
- Press the crust mixture evenly into the bottom of the prepared baking pan. Use the back of a spoon or your hands to compact it firmly.
- Pre-bake the Crust: Bake the crust for 15-18 minutes, or until lightly golden brown around the edges. Remove from the oven and set aside to cool slightly while you prepare the filling. Reduce oven temperature to 325°F (160°C).
- Prepare the Rhubarb: In a medium bowl, combine the chopped rhubarb with ¼ cup (50g) of the granulated sugar. Toss gently and let sit for 10 minutes to allow the rhubarb to release some of its juices.
- Make the Custard: In a separate medium saucepan, whisk together the remaining ½ cup (100g) granulated sugar, cornstarch, and salt.
- Gradually whisk in the thick coconut cream (from the refrigerated can), lemon juice, vanilla extract, and optional turmeric until smooth.
- Place the saucepan over medium heat, stirring constantly. Bring the mixture to a gentle simmer, continuing to stir until it thickens significantly, about 5-7 minutes. It should be thick enough to coat the back of a spoon. Remove from heat.
- Combine and Assemble: Gently fold the sugared rhubarb pieces into the thickened custard.
- Pour the rhubarb custard filling evenly over the pre-baked crust in the pan. Spread it out gently with a spatula.
- Bake the Bars: Return the pan to the oven and bake for 25-30 minutes, or until the custard is set and the edges are lightly golden. The center should still have a slight jiggle, but not be liquid.
- Cool Completely: Remove the pan from the oven and let the bars cool completely on a wire rack at room temperature for at least 2-3 hours. For the best set and clean slices, refrigerate for at least 4 hours, or preferably overnight, before slicing.
- Slice and Serve: Once thoroughly chilled, use the parchment paper overhang to lift the entire slab of bars from the pan. Place on a cutting board and slice into 16 squares.
Pro Tips for Success
- Cold Vegan Butter is Key: For the crust, ensure your vegan butter is very cold. This prevents it from melting too quickly and helps create a tender, flaky shortbread texture. If using your hands, work quickly to avoid warming the butter too much.
- Refrigerate Coconut Milk: For the creamiest custard, refrigerate your full-fat canned coconut milk overnight. This allows the thick cream to separate from the watery liquid. You’ll only use the thick cream for the custard, discarding or saving the liquid for another use.
- Cook Custard Until Thick: Don’t rush the custard cooking process. Stir constantly over medium heat until it visibly thickens and coats the back of a spoon. An undercooked custard won’t set properly, resulting in runny bars.
- Patience with Cooling: Resist the urge to slice these bars warm. They need ample time to cool and chill completely for the custard to fully set and for clean, neat slices. Refrigerating overnight yields the best results.
Variations & Substitutions
- Gluten-Free Option: Substitute the all-purpose flour in the crust with a 1:1 gluten-free baking flour blend that contains xanthan gum. Ensure your blend is suitable for baking.
- Fruit Swaps: While rhubarb is classic, you can experiment with other tart fruits. Try a mix of berries (strawberries, raspberries) with a touch of lemon zest, or even thinly sliced tart apples in the custard. Adjust sugar to taste based on fruit sweetness.
- Spice It Up: Add ¼ teaspoon of ground ginger or cardamom to the custard mixture for a warm, aromatic twist that complements the rhubarb beautifully.
- Citrus Boost: For an extra bright flavor, add 1-2 teaspoons of finely grated lemon zest to the custard along with the lemon juice.
- Nutty Crust: For added texture and flavor, replace ¼ cup of the all-purpose flour in the crust with finely ground almond flour or finely chopped pecans.
Serving Suggestions
These Quick Vegan Rhubarb Custard Bars are delightful on their own, offering a perfect balance of sweet and tart. They make an excellent light dessert after any meal, especially a spring or summer gathering. For an extra touch of indulgence, serve them with a dollop of vegan whipped cream or a scoop of vanilla bean vegan ice cream. They are also fantastic as a portable snack for picnics, potlucks, or packed lunches. Enjoy them with a cup of tea or coffee for a lovely afternoon treat.
Storage & Reheating
- Fridge Storage: Store leftover Vegan Rhubarb Custard Bars in an airtight container in the refrigerator for up to 4-5 days.
- Freezer Storage: These bars freeze well! Once completely chilled and sliced, arrange them in a single layer on a baking sheet and freeze until solid. Transfer the frozen bars to a freezer-safe airtight container or bag, separating layers with parchment paper. They will keep in the freezer for up to 2-3 months.
- Reheating: Thaw frozen bars in the refrigerator overnight or at room temperature for a few hours. They are best enjoyed chilled or at room temperature; reheating is not recommended as it can alter the custard’s texture.
Frequently Asked Questions
Q: Can I use frozen rhubarb?
A: Yes, you can use frozen rhubarb. Do not thaw it before adding it to the custard mixture. Toss the frozen rhubarb directly with the sugar as instructed, and it will cook down nicely in the custard. You might need to add an extra minute or two to the custard cooking time to ensure it thickens properly.
Q: Why did my custard not set?
A: The most common reasons for a runny custard are not cooking it long enough or not chilling it sufficiently. Ensure you cook the custard over medium heat, stirring constantly, until it is visibly thick and coats the back of a spoon. Then, it’s crucial to allow the bars to cool completely at room temperature and then chill in the refrigerator for at least 4 hours, or preferably overnight, for the cornstarch to fully set.
Q: Can I make these bars ahead of time?
A: Absolutely! These bars are an excellent make-ahead dessert. In fact, they taste even better and slice more cleanly after a full night of chilling in the refrigerator. You can prepare them a day or two in advance of when you plan to serve them.
Final Thoughts
These Quick Vegan Rhubarb Custard Bars are a testament to how simple, wholesome ingredients can create something truly spectacular. The delightful contrast of the crisp shortbread, the creamy, tangy custard, and the vibrant rhubarb makes for an unforgettable treat that captures the essence of spring. Whether you’re a seasoned vegan baker or just exploring plant-based desserts, this recipe is approachable, rewarding, and guaranteed to bring a burst of sunshine to your table. Don’t miss out on this seasonal joy – bake a batch today and savor every delicious bite!
