Description

This rosemary-infused prime rib roast paired with creamy garlic mashed potatoes is perfect for a cozy family dinner, holiday celebration, or special weekend gathering. Juicy, tender, and packed with flavor, it’s a dish that turns any meal into a memorable occasion. The aromatic rosemary crust complements the rich, savory beef, while the garlic mashed potatoes provide the perfect buttery, creamy base. This classic combination brings comfort, elegance, and unforgettable taste to your table.

Ingredients

Scale

For the Rosemary Prime Rib:

1 (5–6 lb) prime rib roast, bone-in or boneless
4 cloves garlic, minced
3 tablespoons fresh rosemary, finely chopped
2 tablespoons fresh thyme, finely chopped
1 tablespoon kosher salt
1 teaspoon freshly ground black pepper
2 tablespoons olive oil
1 cup beef broth (for roasting pan)

For the Garlic Mashed Potatoes:

3 lbs Yukon Gold potatoes, peeled and cut into chunks
4 cloves garlic, peeled
1 cup whole milk
1/2 cup unsalted butter
1/2 cup sour cream
Salt and pepper to taste
Fresh chives, chopped (for garnish)

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Instructions

Preheat the oven to 450°F (230°C).
In a small bowl, combine garlic, rosemary, thyme, salt, pepper, and olive oil. Rub the mixture evenly over the prime rib.
Place the roast on a rack in a roasting pan and pour beef broth into the bottom of the pan.
Roast at 450°F for 20 minutes to form a crust.
Reduce oven temperature to 325°F (165°C) and continue roasting until internal temperature reaches desired doneness (120–125°F for rare, 130–135°F for medium-rare, 140–145°F for medium).
Remove roast from the oven, tent with foil, and rest for 20–30 minutes.
Slice roast against the grain and serve.
For mashed potatoes, place potatoes and garlic in a large pot, cover with cold water, and add a pinch of salt. Bring to a boil and cook until tender, about 15–20 minutes.
Drain potatoes and garlic, then mash until smooth.
Warm milk and butter together and gradually mix into the potatoes along with sour cream. Season with salt and pepper.
Garnish with chopped chives and serve alongside the prime rib.

Notes

Use a digital thermometer for accurate doneness.
Fresh herbs are recommended for optimal flavor.
Let meat rest before slicing to retain juices.
Mashed potatoes are best served immediately but can be gently reheated.

Prep Time: 30 minutes
Cook Time: 2 hours