Potato Tacos

Place potatoes in a large pot and cover with cold water by 1 inch. Add vinegar and 2 tablespoons salt. Bring to a boil over high heat and cook until potatoes are just cooked through, about 5 minutes after coming to a boil. Drain potatoes and let rest over sink until mostly dry.

Heat 4 tablespoons vegetable oil in a large non-stick or cast iron skillet over medium-high heat until lightly smoking. Add potatoes, shake to distribute around the pan, and cook, tossing and stirring occasionally until very crisp and golden brown on all sides, about 15 minutes. Season to taste. Serve immediately with tortillas, onions, cilantro, salsa, and limes on the side.