Preheat the oven to 250 degrees F. Scatter the chocolate into a 9- by 13-inch glass baking dish. Roast the chocolate, stirring and smoothing it out with a rubber spatula every 5 to 10 minutes, until it is the color of peanut butter, 30 to 35 minutes. Don't panic if it looks clumpy and crumbly at first; working the chocolate back and forth with a rubber spatula will help it become smooth and creamy. Store at room temperature in a resealable mason jar for up to 2 months.
To reheat, warm the jar in a pot of simmering water.
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