Prepare the ingredients: sift together the almond flour, powdered sugar, and instant coffee powder in a bowl. Beat the egg whites until stiff peaks form, then gradually add the granulated sugar until you have a shiny, stable meringue.
Gently fold the almond flour-coffee mixture into the meringue, ensuring the batter is homogenous and smooth. Be careful not to overmix, or the macarons won't rise properly.
Using a piping bag, pipe even-sized circles onto a baking sheet lined with parchment paper. Let them rest for 30 minutes to allow a skin to form on top.
Bake the macarons in a preheated oven at 300°F (150°C) for 12-15 minutes, until they are slightly crisp on the outside and still soft on the inside.
For the filling, heat the heavy cream, then pour it over the finely chopped dark chocolate. Stir until completely melted, then stir in the butter and let it cool to thicken.
For the caramelized walnuts, melt the brown sugar in a saucepan over low heat, then add the roughly chopped walnuts. Stir to coat the walnuts with the sugar, then spread them out on parchment paper and let them cool completely.
Once the chocolate cream has thickened, gently fold in the caramelized walnuts. Using a spoon or piping bag, fill one half of the macarons with the cream and 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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