INGREDIENTS
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8 slender medium garnet yams or other yams (red-skinned sweet potatoes; about 5 pounds total), rinsed, dried
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1 cup (2 sticks) unsalted butter
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1 small shallot, peeled
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1 garlic clove, peeled
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1 teaspoon coarse kosher salt plus additional for seasoning
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1 tablespoon Dijon mustard
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1 1/2 tablespoons red wine vinegar
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Vegetable oil (for frying)