Cornstarch: 1 tablespoon (optional, for a thicker sauce)
Water: 2 tablespoons (if using cornstarch)
Instructions
Step 1: Preheat Your Oven and Prepare the Pan
Preheat your oven to 325°F (163°C).
Grease a 9×5-inch loaf pan generously with butter or non-stick spray and line the bottom with parchment paper to ensure easy release.
Step 2: Prepare the Dry Ingredients
In a medium bowl, sift together the all-purpose flour, baking powder, and salt. Set aside.
Step 3: Cream the Butter and Sugar
In a large bowl, beat the unsalted butter and granulated sugar using an electric mixer on medium speed until light and fluffy, about 3-5 minutes. This step is crucial for creating a tender and moist texture.
Step 4: Add the Eggs
Add the eggs one at a time, beating well after each addition. Scrape down the sides of the bowl to ensure everything is evenly incorporated.
Step 5: Mix in the Flavorings
Add the lemon zest, lemon juice, and vanilla extract. Beat until well combined, and the mixture is fragrant.
Step 6: Alternate Dry and Wet Ingredients
Reduce the mixer speed to low. Add the flour mixture in three parts, alternating with the sour cream and whole milk. Begin and end with the flour mixture, mixing until just combined. Do not overmix to prevent a dense cake.
Step 7: Transfer to the Pan
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Step 8: Bake the Cake
Bake for 60-75 minutes, or until a toothpick inserted into the center comes out clean. If the top is browning too quickly, tent it with aluminum foil.
Step 9: Cool and Remove
Allow the cake to cool in the pan for 10-15 minutes, then transfer it to a wire rack to cool completely.
Preparation of the Fresh Berry Sauce:
Step 10: Combine the Berries and Sugar
In a medium saucepan over medium heat, combine the mixed berries, granulated sugar, and lemon juice. Stir well.
Step 11: Cook Until Berries Soften
Cook for 5-8 minutes, stirring occasionally, until the berries release their juices and begin to break down. If a thicker sauce is desired, dissolve the cornstarch in water and stir into the berry mixture. Simmer for an additional 2-3 minutes until thickened.
Step 12: Let the Sauce Cool
Remove from heat and let the sauce cool to room temperature. It will continue to thicken as it cools.
