Special equipment: 1 large pastry bag 1 large star or round pastry tip
Preheat the oven to 250 degrees F. Line 2 baking sheets with parchment.
Strain the chickpeas directly into the bowl of a stand mixer. There should be about 3/4 cup liquid; reserve the chickpeas for another use. Add the cream of tartar and a pinch of salt to the liquid, and beat on medium-high speed until very foamy. While still beating, add the sugar, 1 tablespoon at a time, then continue to beat until the mixture forms stiff and glossy peaks, about 4 minutes.
Transfer the mixture to a large pastry bag fitted with a large star or round tip, and pipe 2-inch mounds about 2 inches apart onto the prepared baking sheets. Bake until the meringues are set and no longer glossy, about 2 hours, rotating the trays (from top to bottom) halfway through. Turn the oven off, and let the meringues sit in the closed oven until they have dried out inside, about 1 hour more. (The meringues will keep in an airtight container for up to 3 days.)
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