The Master Mash
Place potatoes and garlic in a large heavy saucepan. Add water to cover and season with salt. Bring to a boil, reduce heat to medium and cook, covered, until very tender, 10 to 20 minutes. Drain the potatoes and return to the pan. Shake the pan over low heat, uncovered, for about 30 seconds, to evaporate excess moisture.Advertisement
Combine buttermilk and oil (or butter) and warm gently in the microwave or on the stovetop. (Do not overheat the buttermilk or it will curdle.)
Off the heat, mash the potatoes and garlic, adding enough of the buttermilk mixture to make a smooth puree. Season to taste with salt and pepper and serve.