¾cup90g fresh or frozen blueberries(defrost and drain if using frozen blueberries)
1tablespoon12g granulated sugar
1tablespoon8g corn starch
1tablespoon9g all-purpose flour
Instructions
Preheat your oven to 350°F. Line an 8x4-inch loaf pan with parchment paper, leaving a 2-inch overhang on opposite ends along the length and butter exposed sides.
In a medium bowl, sift together flour, baking powder and baking soda. Add cornmeal and whisk together to blend evenly.
In the bowl of a stand mixer fitted with the whisk attachment (or using an electric hand mixer) beat eggs with lemon zest and salt on medium-high speed until foamy, about 40 seconds. Gradually add sugar while beating. Increase speed to high and beat until mixture is very pale and almost white in colour, about 5 minutes. The mixture will nearly triple in volume.
In a small bowl, combine melted butter, oil and lemon juice. Whisk it with a fork to blend. Add one-third of the flour mixture to the egg mixture and mix on low to start blending, then add half of the oil mixture and mix until almost blended. Fold in half of the remaining flour mixture followed by the rest of the butter mixture. Finally, gently fold in the last third of the flour mixture using a wide rubber spatula until evenly incorporated. Pour the batter into the prepared pan.
For the blueberry swirl, combine all ingredients in a food processor until smooth. Dollop spoonfuls on top of the lemon batter and swirl it through with a knife.
Bake for 35-40 minutes until the top is golden brown and a toothpick inserted into the center comes out clean. Transfer the pan to a wire rack and let cool completely.