Preheat your oven to 180°C. Pour a teaspoon of vinegar into your mixing bowl and wipe it out with a cloth. Add the egg whites, sugar, and salt and beat for 5 minutes. Meanwhile, sift the almond flour, flour, and powdered sugar.
Line 2 baking sheets with parchment paper, fill a piping bag with a round nozzle, and pipe tubes of about 6 to 7 cm nicely next to each other. Optionally, you can draw lines of 6 cm on the bottom of your parchment paper with a marker, so you can pipe neatly between them. Sprinkle them with almond flakes and bake for 14 to 17 minutes. Remove them and let them cool.
Mix the instant coffee with the hot water until well dissolved, let it cool. Beat the mocha for 1 minute into the vanilla buttercream and place in a piping bag with a serrated nozzle.
Detach the cookies from the parchment paper and pipe the buttercream filling on half of them. Place another cookie on top and let it set in the fridge for at least 1 hour. Once set, dip both ends in the melted chocolate and place them back on a plate with parchment paper to set again.
You can keep them in the fridge for up to a week, but they will be gone much faster than that 😉
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