Sift together the almond flour and powdered sugar in a bowl. In a separate bowl, beat the egg whites until stiff peaks form. Gradually add the granulated sugar, continuing to beat until you have a glossy, stable meringue.
Gently fold the almond flour mixture and lemon zest into the meringue until just combined, creating a smooth and silky batter. Be careful not to overmix, or the macarons won't rise properly.
Using a piping bag, pipe even circles onto a baking sheet lined with parchment paper. Let them rest for 30 minutes to allow a skin to form on the surface.
Preheat oven to 300°F (150°C). Bake the macarons for 12-15 minutes, or until they have developed 'feet' and are slightly crisp on the outside but still soft inside.
For the filling, heat the heavy cream in a saucepan until it just begins to simmer. Pour the hot cream over the finely chopped white chocolate. Let it sit for a minute, then stir until smooth and completely melted.
Stir in the fresh lemon juice and finely chopped mint. Mix well and let the ganache cool and thicken.
Once the chocolate-lemon cream has thickened, use a spoon or piping bag to fill one half of each macaron with the cream. Top with another macaron shell to create a sandwich.
Place the finished macarons on a plate and let them rest in the refrigerator for a few hours to allow the flavors to meld together.
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