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Preheat oven to 200 degrees F.
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Line 2 heavy large baking sheets with parchment paper.
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Place egg whites in clean bowl of an electric mixer.
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Beat on medium speed until foamy.
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Add cream of tartar and increase speed to high.
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Continue beating until soft peaks form.
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Mix in salt.
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Gradually add sugar, 1 tablespoon at a time, beating until stiff peaks form, about 5 minutes.
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Quickly mix in food coloring, 1 drop at a time, until desired color is achieved.
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Transfer meringue to a pastry bag fitted with the star tip.
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Pipe 2-inch-diameter heart-shape meringues onto prepared baking sheets, spacing evenly apart.
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Bake for 1 hour, or until dry and crispy when broken in half.
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Cool meringues completely on baking sheets.
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Store in airtight container at room temperature.