Wash, dry and peel potatoes, then cut into quarters.

Place potatoes into a large pot and cover with cold water. Add 1 t. of salt to water.

Over medium heat, bring to a boil and cook until tender, around 15 minutes.

Drain potatoes and rinse. Return to pan and allow to dry slightly.

Run potatoes through a food mill (or ricer, or strainer). You can use a hand mixer if you would prefer but don't over mix them.

Add milk, butter, and buttermilk gradually, folding continuously.

Season with salt and pepper, to taste. Start with 1/2 t of salt and go from there.

Serve immediately.