Preheat Oven: Set the oven to 350°F. (See notes if your oven runs hot.)
Prepare Pan: Grease and line an 8x8-inch square pan with parchment paper.
Make Lemon Sugar: In a bowl, combine the sugar and lemon zest. Rub them together with your fingers to release the lemon oils.
Melt Chocolate and Butter: In a large mixing bowl, add the chopped white chocolate and butter. Microwave in 15-second intervals until melted, then whisk until smooth.
Combine Ingredients: Add the lemon sugar to the melted mixture and whisk. Add the eggs and whisk. Then, add the lemon juice and mix.
Mix Batter: Add the flour and salt, whisking until smooth.
Bake: Pour the batter into the prepared pan and bake for about 35 minutes or until the top is set. A toothpick inserted should come out with no moist crumbs.
Cool: Let the brownies cool for about 20 minutes.