Wash the potatoes. If there are larger potatoes in the bunch you are using, cut them into one-inch cubes. Some of the potatoes I used could remain whole, while others were too large.
Place the prepared potatoes in a large pot. Cover with water about two inches higher than the potatoes.
Add 1 cup of vinegar to the water and potatoes.
Sprinkle in 1 tbsp of coarse sea salt and stir.
Bring the water to a boil and allow the potatoes to cook until fork tender, about 20 minutes.
Drain the water and let the potatoes rest in the colander 10-15 minutes. In the meantime, preheat the oven to 400 degrees Fahrenheit.
Following the resting period, spread the cooked potatoes onto a rimmed baking sheet in a single layer.
Gently "smash" down each of the potatoes. You can do this by placing a heat resistant spatula on top and hitting them carefully with the heel of your hand. See Tips & Tricks below for suggestions and safety information.
Drizzle 2 tbsp of olive oil over the potatoes. Toss them with your hands to coat both sides.
Sprinkle the potatoes with an additional 1 tbsp of coarse sea salt.
Bake until golden brown and crispy, about 20 minutes.
Dice 1 tbsp of fresh chives while the potatoes roast.
Carefully remove the cooked potatoes to a serving dish.
Evenly sprinkle the chives over the cooked potatoes.