Ingredients
- 3 tablespoons unsalted butter, softened
- 4 ounces Parmigiano-Reggiano, finely grated (1 cup)
- Kosher salt and freshly ground pepper, plus 7 whole black peppercorns
- 5 cups half-and-half
- 32 fresh sage leaves (from 1 bunch)
- 4 cloves garlic, smashed
- 3 pounds sweet potatoes, such as Jewel, Garnet, or Beauregard, unpeeled
- Extra-virgin olive oil, for drizzling
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