Slow Cooker Red Wine and Onion Pork Tenderloin Tips, FAQ & printable recipe

Tips for success

For a more intense onion flavor, you can sauté the sliced onions in a small amount of oil until golden brown before adding them to the slow cooker. This extra step adds a layer of caramelized sweetness that complements the red wine beautifully.

If you prefer a thicker sauce, you can remove the pork once cooked and whisk in a small amount of cornstarch slurry to the liquid in the slow cooker, heating it on high for a few minutes until thickened.

If you find the sauce is too thin or lacks depth, consider adding a tablespoon of tomato paste during the seasoning phase. This provides a subtle umami boost and helps body the sauce. Always ensure the lid of your slow cooker is seated properly throughout the cooking process to trap the moisture and heat, which is essential for the braising action to occur effectively without drying out the tenderloin.

Variations

• Mushroom and Wine Pork: Add two cups of sliced cremini or button mushrooms along with the onions for an earthy flavor profile. The mushrooms soak up the red wine beautifully.
• Garlic and Herb Pork: Incorporate four cloves of minced garlic and a sprig of fresh thyme or rosemary to the cooker for a more aromatic and herbal depth to the finished dish.

Storage and make-ahead

Fridge

Store in an airtight container for up to 3 days. Ensure leftovers are cooled to room temperature within 2 hours before refrigerating.

Freezer

Freeze in a freezer-safe container for up to 2 months. Thaw in the refrigerator overnight before reheating.

Reheat

Reheat gently in a saucepan over low heat or in the microwave until warmed through, adding a splash of water or broth if the sauce has thickened too much.

Store any leftover pork and sauce in an airtight container in the refrigerator for up to 3 days. Ensure the meat is completely cooled before transferring to the container, and try to keep it submerged in some of the liquid to prevent it from drying out during storage.

For longer storage, you can freeze the cooked pork in its sauce for up to 2 months, though the texture of the onions may change slightly upon thawing.

You can prepare the onion and seasoning mixture ahead of time and store it in the refrigerator. When you are ready to cook, simply place the pork in the slow cooker, add the prepared mix and the wine, and start the cooking process.

This saves time during busy weekdays. The dish also develops deeper flavors if refrigerated for a day after cooking, making it an excellent candidate for meal prepping in advance.

Serving ideas

Serve the sliced pork tenderloin with a generous ladle of the red wine and onion sauce poured over the top. The sauce is the highlight of the dish, so ensure there is enough to coat the meat and any accompanying sides. A simple garnish of fresh chopped parsley can add a pop of color and freshness to the plate, contrasting well with the deep, savory tones of the braised meat and the rich red wine gravy.

This dish pairs exceptionally well with starches that can soak up the flavorful sauce. Consider serving it alongside creamy mashed potatoes, buttery egg noodles, or roasted root vegetables like carrots and parsnips.

For a lighter option, a side of steamed green beans or a crisp green salad with a vinaigrette dressing helps balance the intensity of the braised pork and provides a refreshing finish to the meal.

Frequently asked questions

Recipe card

Slow Cooker Red Wine and Onion Pork Tenderloin

Prep 5 minCook 4 hRest 5 minTotal 4 h 10 minServes 4

Ingredients

• 2 lbs pork tenderloin
• 2 cups yellow onions, sliced into half-moons
• 1 packet onion soup mix
• 1 cup dry red wine

Instructions

1. Place the pork tenderloins into the base of the slow cooker. Arrange the sliced yellow onions evenly around and over the meat to ensure they cook down into the sauce.
2. Sprinkle the onion soup mix evenly over the pork and onions. Pour the red wine over the top, covering the ingredients to create the braising liquid that will develop the flavor.
3. Cover and cook on low for 4 hours. Ensure the pork reaches an internal temperature of 145°F (63°C). Remove the pork and let it rest for at least 5 minutes before slicing.

Contains: gluten, sulfites

Estimated nutrition per serving

Calories

280

Protein

32 g

Carbohydrates

12 g

Fat

8 g

Fiber

1.5 g

Sugar

5 g

Sodium

650 mg

Automatic estimate from the ingredient list, not laboratory-verified.