INGREDIENTS
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12 large eggs
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1 tablespoon cold water
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Salt and freshly ground pepper
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4 heaping tablespoons grated Parmigiano-Reggiano
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2 large potatoes, peeled, boiled, and cut into 1/2- to 1-inch chunks
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2 tablespoons (1 ounce) unsalted butter
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2 tablespoons extra-virgin olive oil
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1 small red onion or 2 leeks, chopped