Slow-Cooker Pork Sirloin Roast with Shallots and Carrots

This slow-cooker pork sirloin roast is the definition of set-it-and-forget-it. With just a handful of ingredients—pork, shallots, carrots, and a generous amount of garlic-herb butter—you get a deeply savory, melt-in-your-mouth main that tastes like you simmered it all day.

The vegetables turn sweet and jammy in the buttery juices, and the gravy is perfect for soaking into buttered noodles. It’s a complete dinner that requires almost no effort.

Pork sirloin roast is an undervalued cut: lean, affordable, and incredibly tender when cooked low and slow. Here, it’s paired with whole shallots and baby carrots that caramelize as they cook, while medallions of cowboy garlic butter melt over the top, infusing everything with rich, herby flavor.

The result is a luscious, comforting meal that feels special but takes minutes to assemble. Serve it over buttered egg noodles to catch every drop of the savory gravy.

Ingredients

Why this recipe works

Slow cooking breaks down the connective tissue in pork sirloin, turning a lean cut into fork-tender shreds. The low heat and long cooking time allow the meat to absorb the flavors of the butter, garlic, and herbs without drying out. The vegetables cook in the same juices, picking up sweetness and depth as they soften.

The cowboy butter is the secret: a compound butter with garlic and herbs that melts over the roast, creating a self-basting sauce.

As it melts, it mingles with the pork and vegetable juices, forming a rich, glossy gravy. This method requires no browning, no deglazing, and no extra steps—just layer, cover, and let the slow cooker work its magic.

Notes and substitutions

Pork sirloin roast is leaner than pork shoulder, so it benefits from a longer cook time on LOW to prevent drying. If using pork shoulder, increase the cooking time by 1-2 hours. The roast should be boneless for easy shredding; if using bone-in, remove the bone before serving.

Whole shallots are sweeter and milder than onions, and they hold their shape during long cooking. Baby carrots are convenient, but you can substitute regular carrots cut into chunks.

The cowboy butter is available in some stores, but you can easily make your own by mixing softened butter with minced garlic and chopped fresh herbs like thyme, rosemary, or parsley.

• pork sirloin roast: pork shoulder or pork butt (increase cooking time by 1-2 hours for extra tenderness)
• baby carrots: 2 large carrots, peeled and cut into 2-inch chunks
• whole shallots: 1 medium yellow onion, cut into wedges
• garlic-herb compound butter: 4 tbsp butter mixed with 1 tsp garlic powder and 1 tsp dried herbs (thyme, rosemary, or oregano)

Equipment

• 6-quart slow cooker
• cutting board
• chef's knife
• measuring spoons
• serving spoon
• tongs