Lemon Raspberry Loaf with Raspberry Swirl
A soft, buttery lemon raspberry loaf with ribbons and pockets of homemade raspberry jam, a lemon syrup soak, and a glossy pink raspberry lemon glaze.
Equipment
- 8.5 × 4.5-inch loaf pan (light-colored aluminum strongly recommended)
- Digital kitchen scale (highly recommended for accurate, consistent measurements)
- Small saucepan
- Fine zester
- Skewer
- Pastry brush
- Wire cooling rack
- Parchment paper
Ingredients
Lemon Sugar
- 1 cup granulated sugar (200 g)
- 2½ tablespoons lemon zest (15 g), from about 3 large lemons
Raspberry Swirl
- 1¼ cups raspberries (150 g), fresh
- 3 tablespoons granulated sugar (36 g)
- 1½ teaspoons lemon juice (7 g), fresh
Cornstarch Slurry
- 1½ teaspoons cornstarch (4 g)
- 1 tablespoon + 1 teaspoon water (20 g), cold
Dry Ingredients
- 2 cups all-purpose flour (240 g)
- 2 teaspoons baking powder (8 g)
- ½ teaspoon fine salt (3 g)
Wet Ingredients
- ½ cup butter (113 g), unsalted, melted and slightly cooled
- 2 large eggs (100 g without shells), room temperature
- ⅓ cup sour cream (80 g), full-fat, room temperature
- 2 tablespoons milk (30 g), whole, room temperature
- 2 tablespoons lemon juice (30 g), fresh
- 1 teaspoon vanilla extract (4 g)
Optional Extracts
- ¼ teaspoon almond extract (1 g), optional but recommended
- ¼ teaspoon lemon extract (1 g), optional
Lemon Syrup
- 1½ tablespoons granulated sugar (19 g)
- 1 tablespoon lemon juice (15 g), fresh
Raspberry Lemon Glaze
- 1 cup powdered sugar (120 g)
- 1 tablespoon + 1 teaspoon lemon juice (20 g), fresh, plus a little more if needed
- 2 teaspoons raspberry jam (14 g), reserved from the raspberry swirl
- ¼ teaspoon vanilla extract (1 g)
- small pinch of fine salt
Optional Garnish
- Fresh raspberries
- Lemon zest or curls of lemon peel
- Candied lemon slices
Instructions
Make the lemon sugar
- Rub the lemon zest into the sugar with your fingertips for 1–2 minutes, until very fragrant and the sugar looks and feels like damp sand.
Cook the raspberry swirl
- Combine the raspberries, sugar, and lemon juice in a small saucepan. Cook over medium heat, stirring occasionally, until the berries have softened and mostly broken down and the mixture is bubbling and juicy.
- Stir the cornstarch and cold water together until completely smooth. Slowly stir the slurry into the raspberry mixture to prevent clumping.
- Continue cooking for about 8–10 minutes, stirring frequently, until the mixture is very thick and jammy. A spoon dragged through the pan should leave a clear trail that does not fill in. Reduce the heat slightly if the mixture begins bubbling too aggressively or starts to stick.
- Let the jam cool in the saucepan for 5 minutes, then transfer it to a bowl. You should have about 120–125 g, or a generously rounded ⅓ cup. Reserve 2 teaspoons (14 g) for the glaze, then refrigerate both portions until completely cool. Once chilled, a spoonful should mound at first and then slowly settle. It should be thick and spoonable, not firm or gel-like.
Prepare the batter
- Preheat the oven to 350°F. Line an 8.5 × 4.5-inch light-colored aluminum loaf pan with parchment paper, leaving enough overhang on the long sides to create a sling.
- In a separate bowl, whisk together the flour, baking powder, and salt.
- Whisk the eggs into the lemon sugar. Gradually whisk in the melted butter, cooled for about 5 minutes, or until warm but not hot.
- Add the sour cream, milk, lemon juice, vanilla, and optional extracts. Whisk vigorously for 30–45 seconds, until the mixture is smooth and glossy with no visible streaks of egg or sour cream.
- Fold the dry ingredients into the wet mixture with a spatula just until no dry streaks of flour remain.
- Let the batter rest at room temperature for 15 minutes. It will thicken slightly, which helps support the raspberry jam as the loaf bakes.
Assemble the loaf
- Spread about one-third of the batter evenly into the prepared pan.
- Make sure the raspberry jam is completely cool and that you’ve reserved 2 teaspoons (14 g) for the glaze. Drop half of the remaining jam over the batter in about 8–10 small spoonfuls, leaving some batter visible between them.
- Drop spoonfuls of half the remaining batter evenly over the raspberry layer. Gently nudge the batter together, then dot the remaining raspberry jam over the top.
- Insert a butter knife about three-quarters of the way into the batter. Make one gentle zigzag pass lengthwise and one crosswise. Some resistance is normal because both the batter and jam are thick.
- Drop the remaining batter over the raspberry swirl and gently spread it to cover. Remove any parchment clips before baking, if used.
Bake
- Bake for 55–60 minutes. Check the loaf around 50 minutes and tent loosely with foil if the top is already nicely browned.
- The loaf is done when the center looks set and the top springs back lightly when touched. A tester inserted into a cake portion near the center, avoiding the raspberry jam, may come out clean or with a few moist crumbs. Moist crumbs are fine, but there should be no wet, shiny, paste-like batter.
- Cool the loaf in the pan for 30 minutes to let the moist crumb set and gain structure. Use the parchment sling to lift it from the pan, transfer it to a wire cooling rack, and cool completely. Cooling completely before adding the syrup gives the crumb time to fully set before the extra moisture is added.
Add the lemon syrup
- Stir the sugar and lemon juice together until combined.
- Once the loaf is completely cool, poke about 15 small holes evenly across the top with a skewer.
- Brush the syrup over the top and sides of the loaf in a few slow passes, allowing it to soak in between each one.
Make the raspberry lemon glaze
- Whisk the powdered sugar, lemon juice, reserved raspberry jam, vanilla, and a small pinch of salt until smooth. The glaze should be pink, thick, and pourable, falling from a spoon in a slow ribbon. If needed, add a little more lemon juice to reach the right consistency.
- Once the lemon syrup has soaked in, spoon the glaze over the top of the loaf and let it run naturally down the sides.
Garnish, if desired
- Let the glaze set, then garnish with fresh raspberries, lemon zest, or curls of lemon peel. Candied lemon slices also make a pretty finishing touch. If using fresh lemon slices, add them just before serving so they don’t soften the glaze.
Notes
- For the most consistent results: I recommend using the gram measurements when possible, especially for the flour. Volume measurements are also provided.
- Loaf pan: For best results, use an 8.5 × 4.5-inch light-colored aluminum loaf pan. A 9 × 5-inch pan will produce a shorter loaf and may bake differently.
- Room-temperature ingredients: The eggs, sour cream, and milk don’t need to reach a precise temperature. If possible, set them out for a little while before baking so they aren’t refrigerator-cold. Taking off the chill helps the melted butter blend into the batter more smoothly. If you forget to set out the eggs, place them in a bowl of warm water for 5–10 minutes.
- Raspberry jam: Make sure the jam is completely cool before layering it into the batter. Reserve 2 teaspoons (14 g) for the glaze.
- Raspberry pockets: For more distinct pockets of raspberry instead of ribbons, layer the jam in small spoonfuls as directed but skip the knife swirl. Keep the dollops separated rather than spreading them into a solid layer.
- Frozen raspberries: I developed and tested this recipe with fresh raspberries. Frozen raspberries should work for the cooked jam, but they may release more liquid and need additional cooking time. Use the consistency cues rather than relying on the clock.
- Seedless option: For a seedless glaze, press the reserved raspberry jam through a fine-mesh sieve before using. You can also strain the full batch if you prefer a seedless raspberry swirl, although I haven’t tested that variation.
- Batter rest: The 15-minute rest allows the batter to thicken slightly, which helps support the raspberry jam. In my testing, the rested batter also produced a slightly fuller rise.
- Sour cream substitute: Full-fat Greek yogurt can generally replace the sour cream in the same amount. I haven’t tested that substitution specifically in this loaf, so the texture may vary slightly.
- Salted butter: If using salted butter, reduce the added fine salt to about ¼ tsp.
- Altitude: I develop and test my recipes at approximately 4,800 feet in Utah. This recipe has not yet been independently tested at sea level, so baking time and rise may vary somewhat at a significantly different elevation. Use the visual doneness cues along with the suggested baking time.