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Preheat oven to 170 Celsius degrees.
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Arrange the baking rings (7 cm in diameter) on a baking tray lined with baking paper. Do not grease it in any way.
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In a small bowl, mix ground almonds, sugar powder and chopped pistachios.
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In a mixer bowl whip egg whites and salt. When white foam begins to form. Gradually add the sugar and continue whipping until stable meringue forms.
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Place the pistachio paste in a small bowl and mix gently with 3-4 tablespoons of meringue until smooth.
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Add the pistachio mixture into the remaining meringue and fold with a spatula until smooth and stable. It is better to leave traces of egg whites other than "overthrow" the mixture too much.
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Transfer the mixture into a pastry bag with 1 cm round piping tip and pipe inside each ring spiral shape on the base, and small dense droplets on the sides.
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Sprinkle a little sugar powder and chopped pistachios on top and bake for about 20 minutes, or until golden and set.
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Cool slightly at room temperature, and then cool in the freezer.
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Using a sharp small knife, go through and around the sides of the baking rings to extract the base of the molds.