Skip to content
Allquickyrecipes Search recipes

Dinner · Part 2 of 3: Instructions

Slow-Cooker Garlic Herb Butter Pork Loin Roast Step-by-step instructions

A golden-brown sliced pork loin roast served on a wooden board with baby carrots and onions.
Prep
Cook
Total
Serves
6
Includes 10 min resting

Before you start

Before beginning, ensure your ingredients are properly measured and the pork loin is at room temperature for about 30 minutes. If the pork is not tied, secure it with kitchen twine to ensure it maintains a uniform shape, which promotes even cooking.

Have your slow cooker clean and ready on your counter, and ensure your fresh herbs are washed, dried, and finely chopped for the compound butter.

Ingredients at a glance (9)
  • 4 lb boneless pork loin roast, tied
  • 1 lb baby carrots
  • 1 lb pearl onions
  • 1/2 cup softened butter
  • 4 cloves garlic, minced
  • 1 tbsp fresh rosemary, chopped
  • 1 tbsp fresh thyme, chopped
  • 3/4 cup dry white wine
  • 1/2 cup chicken broth

Instructions

Preparing the Compound Butter

  1. Prepare the Garlic Herb Butter
    In a small bowl, combine the softened butter with the minced garlic, chopped rosemary, and chopped thyme. Mix thoroughly until the herbs and garlic are evenly incorporated into the butter. Set this herb-infused mixture aside until the meat is ready to be prepared for the slow cooker.
    Look for The butter should be smooth and the herbs evenly distributed.
    Tip Ensure the butter is truly softened to room temperature for easier mixing.

The butter mixture should be thoroughly combined with the garlic and herbs. The texture should be spreadable and consistent, ensuring that when it hits the pork, it will melt evenly.

This step is crucial for building the primary flavor profile of the dish, so take the time to blend the aromatics well.

Assembling the Slow Cooker

  1. Layer and Season the Roast
    Place the baby carrots and pearl onions into the bottom of the slow cooker to create a base. Place the tied pork loin roast on top of the vegetables. Slather the entire surface of the pork loin generously with the prepared garlic herb butter. Pour the white wine and chicken broth around the sides of the roast into the slow cooker, being careful not to wash the butter off the top of the meat.
    Look for The roast is coated evenly in butter and the liquid surrounds the base.
    Tip If the roast is not already tied, use kitchen twine to secure it so it holds its shape during the long cooking process.

The carrots and onions should form a stable bed at the bottom of the cooker. The pork loin must be securely positioned on top and coated completely with the herb butter. The liquids should be poured gently into the base, ensuring they do not disturb the butter layer on top of the meat.

Cooking and Basting

  1. Slow Cook and Serve
    Cover the slow cooker and cook on the LOW setting for 5.5 hours. Periodically baste the roast with the pan juices to keep the meat moist and flavorful. Once the time is up, use a meat thermometer to ensure the pork reaches an internal temperature of 145°F (63°C). Remove the pork to a cutting board, cover loosely with foil, and let it rest for at least 10 minutes before slicing into thick slabs. Serve with the vegetables and pan juices.
    Look for The pork is tender and reaches an internal temperature of 145°F.
    Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
    Tip Basting helps the exterior of the pork develop a rich, buttery flavor as the juices concentrate.

During the cooking phase, the slow cooker should emit a rich, savory aroma. The meat should be visibly tender and the pan juices should be bubbling gently. By the end of the cooking time, the internal temperature must reach 145°F, confirming the roast is safe to eat and perfectly cooked.

Common mistakes

A common mistake is overcooking the pork, which can lead to dryness despite the slow cooker's moisture. Always start checking the internal temperature around the 5-hour mark.

Another error is neglecting to let the meat rest after cooking; slicing immediately causes the flavorful juices to escape, resulting in a less succulent roast. Finally, ensure you do not use a high-sugar wine, as this can cause the sauce to become overly sweet.

How to tell it’s done

The pork loin is perfectly done when it reaches an internal temperature of 145°F (63°C) when measured with a meat thermometer at the thickest part.

The meat should be firm to the touch but yield slightly, and it should be easy to slice into clean, tender slabs without falling apart completely. Always allow the meat to rest for at least 10 minutes to redistribute the juices.

  • Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest

Coming up in Part 3: common questions

  • Can this pork loin roast be made in a pressure cooker?
  • Why is it necessary to let the meat rest after cooking?
  • Can the pearl onions be replaced with regular onions?

Also in Part 3: variations (Lemon Herb Pork, Spicy Garlic Pork), storage and make-ahead, and the printable recipe card.

Up next · Part 3 of 3

2 variations · storage & make-ahead · 3 answers · printable card

Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)