Adjust the oven rack to the lower third position and preheat the oven to 325°F.
Add the granulated sugar to the bowl of a food processor or blender. Pulse for 10 to 20 seconds to create a super fine texture. Remove 3/4 cup of sugar to a separate bowl.
In a medium bowl, add the remaining 1 cup of granulated sugar, cake flour and salt.
1 3/4 cups granulated sugar, 1 cup cake flour, 1/4 teaspoon salt
Using a handled mixer or stand mixer fitted with the paddle attachment, beat the egg whites and cream of tartar together on medium speed until until foamy, about 1 minute. Add the 3/4 cup of reserved sugar and turn the speed to high and whip for 5-6 minutes until soft peaks form.
12 large egg whites, 1 1/2 teaspoons cream of tartar
Add the vanilla extract, lemon extract and lemon zest and beat until just combined.
1 1/2 teaspoons vanilla extract, 1 1/2 teaspoons lemon extract, Zest of 1 lemon
Sift the flour mixture into the egg white mixture in three separate additions. Gently fold the flour into the egg whites with a rubber spatula after each one.
Scrape the batter into a 10-inch angel food cake pan (tube pan). Do NOT grease the pan.
Bake for 40-45 minutes or until a toothpick inserted in the center comes out clean. Rotate the pan in the oven half way through to ensure even baking.
Cool the cake upside down set on a wire rack for approximately 3 hours. Once cooled, run a knife around the outside of the pan and gently tap the sides until the cake releases.
Serve a spoonful of strawberry compote on top of a piece of angel food cake. Store both separately in an air tight container. Thin compote by heating in the microwave for a few seconds.