How to Make It
In a large saucepan, cover the potatoes with water and bring to a boil over high heat. Cook until the potatoes are tender, 10 to 15 minutes.
Drain the potatoes, shaking them to remove the excess water. Return the potatoes to the saucepan and mash, adding the buttermilk. Stir in the chives and tarragon, season with salt and pepper and serve.