Instructions: Heat oven to 175 degrees. Line two baking pans with Silpats (French nonstick baking mats). With very sharp knife, slice grapefruit into 1/16-inch-thick slices. Place slices on prepared baking pans.

Place confectioners sugar in a strainer; sprinkle over grapefruit. Turn chips over, coat with remaining sugar. Bake until chips glisten and have a syrupy coating, 1 1/2 to 2 hours.

Remove baking pans from oven; with tongs, turn chips over. Return baking pans to oven, rotating shelves. Cook until lightly golden and crispy, 1 1/2 to 2 hours. Transfer chips to rack to cool and harden. Store in an airtight container up to 3 days.

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