Place the rack in the center of the oven. Preheat the oven to 335 °F (168 °C) and line two round 8” pans with parchment paper.
In a medium mixing bowl, stir together the flour, salt, and baking powder. Set aside.
2 cups (240 grams) flour, 1 1/4 teaspoons salt, 2 teaspoons baking powder
In a large mixing bowl with an electric hand mixer or a stand mixer with a whisk attachment, beat the eggs, sugar, vanilla extract, and lemon extract at medium-high speed for about 2 minutes until it's thickened and a light gold color. Should your stand mixer not have a whisk attachment, then beat the mixture for 5 minutes using the paddle attachment.
4 large eggs, 1 3/4 cups (350 grams) granulated sugar, 1 1/2 teaspoons vanilla extract, 1 1/2 teaspoons lemon extract
Beat in the dry ingredients on low speed just until combined. Use a silicon spatula to scrape the bottom and sides of the bowl and mix briefly to incorporate.
In a small saucepan, heat the milk and lemon zest over medium heat. You shouldn't let it boil. When you see small bubbles start to appear around the edge of the saucepan, it's ready. The temperature will be 180-185 °F (82-85 °C). Remove the pan from the heat and stir in the butter and oil until the butter has melted.
1 cup (240 ml) milk, 2 tablespoons lemon zest, 1/4 cup (56 grams) unsalted butter, 1/3 cup (67 grams) canola
Slowly stir the milk mixture into the batter at low speed and mix until totally combined.
Divide the batter evenly between the two prepared pans. That’s 580 grams (about 2 3/4 cups) per pan or 598 grams if using Bob's GF flour.
Bake the for 33-45 minutes or until a toothpick inserted into the center comes out clean and the top is set.
Remove to a wire rack to cool for 15 minutes and then turn the cakes onto the wire rack to cool completely, about 2 hours. The cake might seem a little dry at this point, but it gets moister as it sits.