1. Melt chocolate, stirring, in a heatproof bowl set over a pan of simmering water. Turn off heat. Let cool slightly. Spread 1/4 of the chocolate over the back of a rimmed baking sheet. Refrigerate until just starting to set, 15 minutes.

2. Using a bench scraper held at a 45-degree angle, scrape chocolate into 1/2-inch-wide curls. (If chocolate breaks, let it stand to warm slightly. If chocolate is too soft, refrigerate until just starting to set.) As you work, transfer curls to a rimmed baking sheet in the refrigerator. Repeat with remaining chocolate. Refrigerate curls until firm.