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Heat a pot with boiling water over a low-medium flame.
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In a fireproof bowl (or a stainless-steel bowl of an electric stand mixer) put the egg whites, sugar and salt and place on the pot with the boiling water.
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Mix the egg whites mixture (no need to whisk) and cook gently in this way until the sugar dissolves.
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Remove from the heat and beat the egg whites mixture at high speed for 8-10 minutes, or until you get a very stable Swiss meringue. If desired, add a teaspoon of vanilla extract at the end of the whipping.
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Transfer the meringue to a piping bag fitted with a smooth 2-3 cm round piping tip.
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Drizzle small mounds of meringue on top of the cookies.
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Freeze the Krembo cookies for about an hour before coating to set.