Preheat your oven to 300°F (150°C). In a clean, dry mixing bowl, whip room temperature egg whites with cream of tartar on medium speed until foamy.

Gradually add granulated sugar while continuing to beat until stiff peaks form and the meringue is glossy, about 5-7 minutes.

Sift together super fine almond flour and confectioners' sugar into a bowl. Fold this mixture into the whipped meringue until no dry ingredients remain.

Continue folding the batter until it flows slowly from the spatula and resembles lava. Transfer to a piping bag fitted with a round tip.

Line two baking sheets with parchment paper and pipe the macaron batter onto the sheets, filling 1.5-inch circles. Tap the trays to eliminate air bubbles.

Let the shells rest at room temperature until a skin forms, about 30-60 minutes. Bake for 19-23 minutes, ensuring they do not brown.

Allow the macarons to cool completely on the baking sheets before removing them.

Make the ganache by heating heavy cream until simmering, then pouring it over chopped chocolate. Stir in unsalted butter until smooth.

For the buttercream, beat unsalted butter and marshmallow fluff until light, then mix in confectioners' sugar and vanilla extract.

Pipe marshmallow buttercream onto half the macaron shells, torch the tops lightly for caramelization, drizzle with ganache, and top with matching shells.

Refrigerate the assembled macarons overnight to allow flavors to meld. Before serving, let them sit at room temperature for 30 minutes.