20-Clove Garlic Confit Crockpot Prime Rib Roast

This 20-clove garlic confit Crockpot prime rib roast is the ultimate set-it-and-forget-it dinner. A boneless rib roast simmers on low for seven hours with whole garlic cloves, fresh rosemary, salted butter, and rich beef demi-glace until it shreds like butter.

The garlic transforms into a sweet, mellow paste that melts into the sauce, coating every strand of beef. Pile it onto toasted ciabatta rolls for a steakhouse-worthy sandwich that tastes like it took hours of hands-on work—but the slow cooker does it all.

Forget everything you know about prime rib being a fussy, oven-bound roast. This version takes the same luxurious cut and lets a Crockpot work its magic. Twenty garlic cloves soften into a golden confit that you mash into the buttery cooking liquid, creating a sauce that clings to every shred of beef.

The rosemary adds an earthy, piney note that complements the richness. Serve it piled high on toasted ciabatta, or over mashed potatoes, or straight from the pot—it's that good.

Ingredients

Why this recipe works

The slow cooker's low, steady heat breaks down the connective tissue in the rib roast, turning a typically dry-roasted cut into pull-apart tender meat. The long, moist cooking environment keeps the beef juicy while allowing the fat to render into the sauce.

The 20 garlic cloves, simmered in butter and demi-glace, undergo the same transformation as confit garlic: they become sweet, nutty, and spreadable, losing all their sharp bite. This dual transformation—tender beef and mellow garlic—is what makes the dish so remarkable.

The method is almost entirely hands-off. You simply nestle the roast with the aromatics and butter, cover, and walk away for seven hours. The slow cooker does the work, and the result is a deeply flavored, restaurant-quality meal with minimal effort. The garlic-butter sauce that forms is the real star: it's rich, glossy, and infused with rosemary, perfect for spooning over the shredded beef or sopping up with crusty bread.

Notes and substitutions

Choose a boneless beef rib roast (also labeled prime rib roast) for the best marbling and flavor. If you prefer a leaner option, a chuck roast works, but it will have a different texture.

The garlic cloves should be whole and peeled; do not chop them, as they need to soften and melt into the sauce. Fresh rosemary is essential—dried rosemary will not provide the same aromatic quality. Use salted butter for seasoning; if using unsalted, add a pinch of salt.

Beef demi-glace is a rich, concentrated sauce that adds deep umami. If you cannot find it, substitute beef broth (about 1 cup) plus a splash of Worcestershire sauce. The ciabatta rolls are for serving; you can also use crusty sourdough or hoagie rolls. Toasting the rolls is important to prevent sogginess. The recipe makes about six hearty sandwiches, but you can easily double it for a crowd.

• boneless beef rib roast: boneless chuck roast or beef sirloin roast; cook time may vary slightly
• salted butter: unsalted butter plus 1/2 teaspoon salt
• beef demi-glace: beef broth (use 1 cup) plus 1 tablespoon Worcestershire sauce
• fresh rosemary: 2 teaspoons dried rosemary

Equipment

• Crockpot (slow cooker)
• Two forks for shredding
• Measuring spoons
• Small bowl for mashing garlic
• Toaster or oven for rolls