Strawberry Rhubarb Buckwheat Bars
Strawberry Rhubarb Buckwheat Bars are a rustic, slightly nutty bar with a tender, buttery crust and a glossy, tart fruit filling. The buckwheat gives the crust earthy depth while the strawberry and rhubarb filling sings with bright, balanced sweetness. Perfect for spring gatherings or an easy weekend bake, these bars are both portable and crowd pleasing, a reason to make them again and again.
Equipment
- Oven
- 9 x 13-inch baking pan
- Food Processor
- Small Saucepan
Ingredients
- 2 1/4 cups whole-wheat flour Provide structure and whole-grain nuttiness to the bars while contributing fiber and a denser crumb; combine with wet ingredients to form the dough and balance sweetness.
- 3/4 cup buckwheat flour Add an earthy, slightly bitter flavor and tender crumb while boosting protein and gluten-free characteristics; blend with whole-wheat flour for depth and texture.
- 1/2 cup coconut sugar Sweeten naturally while adding a hint of caramel flavor and contribute to a firmer, slightly chewy crumb when mixed into the dough.
- 1 teaspoon kosher salt Enhance overall flavor by balancing sweetness and strengthening gluten formation slightly; help control fermentation and improve dough handling.
- 1 teaspoon baking powder Leaven the dough subtly to give a light lift and prevent the bars from becoming overly dense, ensuring a tender bite without large air pockets.
- 1 cup unsalted butter cold, cut into cubes Provide rich fat for a flaky, tender texture and carry flavor; cutting cold butter into the dry mix creates pockets that yield a short, crumbly crust.
- 1 egg Bind ingredients together and add moisture; contribute a bit of richness and color while helping the dough set during baking.
- 2 tablespoons honey Add gentle sweetness and moisture while enhancing flavor complexity; help keep the filling slightly glossy and improve mouthfeel.
- 3 tablespoons molasses Contribute deep, robust sweetness and a touch of molasses flavor that intensifies the baked aroma and balances fruit tartness.
- 2 cups strawberries tops removed Bring fresh sweet-tart berry flavor and juicy texture when cooked; contribute natural pectin and vibrant color to the fruit layer.
- 2 cups rhubarb chopped Introduce bright tartness and firm texture that contrasts the strawberries; soften when cooked and release moisture for the filling.
- 12 ounces strawberry preserves jar, no sugar added Provide concentrated strawberry flavor and additional sweetness to create a jammy, spreadable layer that boosts fruit intensity.
- 1 tablespoon cornstarch Thicken the fruit mixture by absorbing excess liquid and creating a cohesive, jam-like filling that prevents sogginess in the bars.
- 2 teaspoons lemon juice Brighten flavors and activate pectin slightly while balancing sweetness; preserve fresh fruit brightness and enhance overall tartness.
Instructions
- Preheat oven to 375°F. Lightly spray a 9 X 13-inch baking pan.: When you first turn on the oven you feel that faint whoosh of heat and the faint smell of warming metal, which signals the start of transformation. This step ensures the oven environment is stable when the dough goes in, helping the crust set properly and bake evenly. Make sure the oven racks are positioned so the pan will sit in the center, it prevents over browning on the top or bottom. A common mistake is preheating too briefly, which can cause the crust to spread rather than set. If you use a baking spray or line the pan with parchment, it will release cleanly after baking.
- In a food processor, pulse whole wheat flour, buckwheat flour, coconut sugar, salt, and baking powder in a food processor until well combined. Add butter cubes and pulse until the mixture is crumbly. Add egg, honey, and molasses and pulse until well combined and large clumps form. Reserve 1/2 cup of the mixture and pour the remainder into a prepared baking pan and press into the bottom and slightly up the sides to form a crust.: As you pulse the dry ingredients you will notice the flour and sugar marry into a uniform texture, it smells faintly of nutty grain from the buckwheat flour . Adding the cold butter creates pea size bits that are key for a tender, crumbly crust, and the sound in the processor changes from a steady hum to a broken rattle. Once you add the egg , honey , and molasses , larger cohesive clumps will form which are perfect for pressing; these clumps give the crust structure and moisture. Press the dough evenly into the pan using your fingertips or the bottom of a measuring cup, creating a uniform base and a slight rim to contain the filling. A common misstep is over processing, which melts the butter and yields a greasy, dense crust. If your workstation gets warm, chill the bowl for a few minutes before pressing.
- Bake for 10 minutes, remove from oven and cool.: During this short bake the crust will begin to set and emit a warm, toasty aroma. You will notice the color shift from pale to faintly golden at the edges, and the surface will feel set to the touch. Cooling briefly stabilizes the base so it does not sink when the filling is added. Avoid skipping the cool down, because a hot crust can cause the filling to soak in and the texture to become too soft. If the crust seems unevenly browned, rotate the pan midway through the bake next time to encourage even color.
- Combine all ingredients in a food processor and lightly pulse together just to combine ingredients. Pour into a small saucepan and heat on medium heat until preserves had melted and a sauce begins to form. Pour over cooled crust and crumble reserved 1/2 cup of crust mixture on top.: When you pulse the strawberries , rhubarb , strawberry preserves , cornstarch , and lemon juice , the mixture will take on a chunky jam like texture that smells bright and slightly sweet. Transferring to the saucepan, you will hear a gentle simmer and watch the preserves melt into the fruit, releasing steam and a fragrant fruity perfume. The sauce will thicken noticeably as the cornstarch activates, forming a glossy coating that clings to the fruit and signals readiness. Pour carefully over the cooled crust to avoid splashing, and sprinkle the reserved crumb mixture evenly so you get crunchy pockets on top. A typical error is overheating the filling which can break down the fruit too much, so maintain a gentle simmer and stir frequently.
- Bake for about 20 minutes until filling is bubbly and top begins to lightly brown. Cool completely before cutting and serving. If desired, sprinkle with powdered sugar.: As the pan returns to the oven you will see the filling begin to bubble at the edges, and the top crumbs will turn a light golden brown releasing a toasty aroma that promises texture. The bubbling is a visual cue that the filling is cooked through and the cornstarch has done its job. Cooling fully is essential, the filling will set and firm up, making clean slices possible. A common mistake is slicing the bars too soon which yields a runny center; patience rewards you with perfectly shaped squares. If you choose to dust with powdered sugar, do so just before serving to keep the sugar from dissolving into moisture.
Notes
- Measure flour accurately: Spoon the whole wheat flour and buckwheat flour into the cup and level it off rather than scooping to avoid a dense crust.
- Pulse rather than over mix: Using short pulses in the food processor keeps the butter in pea sized pieces, which creates a tender crumb when baked.
- Evenly chop rhubarb: Chop the rhubarb into uniform pieces so it cooks evenly and the filling has consistent texture.
- Watch the filling as it heats: Simmer on medium and stir frequently so the preserves melt smoothly and the mixture thickens without scorching.
- Use a parchment sling: Line the pan with parchment for easier removal, especially if you want neat squares for serving or gifting.