Potatoes and greens

1 large bunch greens, about 1 pound, stemmed and washed well (collards, kale, chard, and mustard all work well)
Salt to taste
3 tablespoons extra virgin olive oil
1 onion, sliced very thin
2 to 4 garlic cloves sliced thin
¾ pound yellow-fleshed potatoes, such as Yukon gold

Bring a large pot of water to a boil. Fill a bowl with ice water. When the water comes to a boil, salt generously and add the greens. Blanch for 2-4 minutes (hearty greens like collard and kale take longer than chard or mustard), and transfer to the ice water with a slotted spoon or skimmer. Drain and squeeze out extra water. Chop coarsely. Set aside the cooking water.
Heat 2 tablespoons of the oil over medium heat in a wide, lidded skillet or Dutch oven, and add the onion. Cook about three minutes. Add salt and garlic. Continue to cook, stirring often, until the onion is tender, about five minutes. Stir in the greens and then add 1 cup of the cooking water and salt to taste. Bring to a simmer, cover partially, and simmer over low heat for 45 minutes to 1 hour, stirring often and adding more cooking water from time to time, so that the greens are always simmering in a small amount of liquid.
While the greens are cooking, scrub the potatoes and add to the pot with the cooking water. Bring back to a boil, lower the heat and simmer until the potatoes are tender, about 25 minutes. Remove the potatoes from the cooking water, and allow to cool slightly so that you can peel them if you wish. Cut them into large chunks.
Uncover the greens, and add the potatoes. Using a fork or the back of a wooden spoon, crush the potatoes and stir into the greens. Add a tablespoon of olive oil and salt and pepper to taste, and stir over low heat until the greens and potatoes are well combined. Enjoy!