Gingerbread Cookies

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• Put butter, brown sugar, syrup in a pot and melt it together into a homogeneous mass over low heat.
• Set the melted mixture aside and let it cool down until it's lukewarm.
• Put flour, salt, ammonium bicarbonate, ginger, and cinnamon in a bowl and mix together.
• Add the cooled mixture to the flour mixture along with an egg. Knead together into a firm and smooth dough.
• Let the dough rest in the refrigerator for 2 hours.
• Preheat the oven to 180 degrees Celsius (356 degrees Fahrenheit) conventional oven,
• Roll out the dough to a thickness of 3-5 millimeters and cut out Christmas cookies.
• Bake the cookies for 7-10 minutes, in the middle of the oven.
• Let the baked cookies cool on a wire rack before decorating.
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• Whisk egg whites, powdered sugar, and white wine vinegar together into a firm and stiff meringue.
• Put the finished icing into a piping bag and cut a small hole in the bag.
• Now it's just time to decorate and eat.
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