Peel potatoes and cut into uniform pieces.

In a large saucepan, cover potatoes with water and bring to a boil.

Boil for 15 minutes, or until potatoes are tender.

Drain potatoes and return them to the pot.

Grate garlic into the potatoes using a Microplane or fine grater.

Warm milk in a separate pan or microwave.

Add warm milk, sour cream, unsalted butter, salt, and freshly ground black pepper to the potatoes.

Mash the potatoes until smooth, adding more milk if necessary to reach desired consistency.

Grate carrot using a grater.

Stir grated carrot into the mashed potatoes.

Serve hot.