Heat 1 tablespoon of the oil in an 8- to 10-inch nonstick skillet over medium-high heat. Add the onion and cook, stirring, until wilted and beginning to turn lightly golden, 6 to 8 minutes. Add the garlic and cook, stirring, for about 2 minutes longer.
Add 1 tablespoon more olive oil to the skillet. Add the potatoes, salt them, and grind a generous amount of pe