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Preheat oven to 200°F/ 93°C
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Fit a ½ inch (1 cm) tip into a pastry bag and set upright inside a tall drinking glass. Fold the edges of the pastry bag over the glass rim. Set aside.
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Prepare two rimmed sheet pans. Cover each sheet pan with parchment paper. Set aside.
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Add egg whites and vinegar to the bowl of an electric mixer fitted with a whisk attachment. Whisk the egg whites at medium speed until they are light and foamy with soft peaks, about a couple of minutes.
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Turn up the speed to medium-high and add the granulated sugar a tablespoon at a time, whisking the whites for a few seconds between additions. It will take around 6 minutes to add all the sugar.
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Once all the sugar is added, turn the speed up to high and whisk the meringue until glossy and stiff peaks form, about 3 minutes.
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Optional: If you want crushed peppermint candy in your meringue cookies, using a rubber spatula, fold in 2 Tablespoons of finely crushed peppermint candy into the meringue before you add the food coloring.
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Remove the bowl from the mixer, and add 12 drops of red food color scattered about the meringue. Do not mix.
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Spoon the meringue into the pastry bag, or gallon size Ziploc plastic bag, without stirring the meringue. Once all the meringue is added, twist the bag closed and squeeze down on the bag until the meringue is down to the tip without air pockets. If using a Ziploc bag, snip off the tip of a corner making a ½ inch (1 cm) opening.
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Using gentle, squeeze the meringue out of the piping bag and make a 1½ inch (4 cm) circle in an upward spiral, and space each meringue cookie about an inch (2.5 cm) apart.
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Bake in the oven for 2 hours, or until the meringue is dry.
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Turn off the oven and cool the meringue cookies in the oven. Once cooled, remove the meringue cookies and decorate, or store in an air tight container. Meringues do not like damp conditions or humid weather. Keep them out of the humidity or air long as possible.
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Decorate as you wish.