Sweet Pepper Dijon Cream Pork Sirloin Roast

This slow cooker pork sirloin roast is the definition of set-it-and-forget-it. A handful of ingredients—pork, bell peppers, onion, sour cream, Dijon, and au jus—go into the crock and come out hours later as a tender, shreddable roast with a velvety, tangy gravy. Perfect for busy weeknights or lazy Sundays.

The beauty of this recipe is its simplicity. There’s no searing, no sautéing, no fuss. Just layer the ingredients in the slow cooker, walk away, and return to a dinner that tastes like it simmered all day—because it did.

The pork sirloin roast becomes fork-tender, the peppers soften into sweet ribbons, and the sour cream and mustard meld into a rich, creamy sauce that coats every strand of meat. Serve it over rice, mashed potatoes, or crusty bread to soak up every drop.

Ingredients

Why this recipe works

The slow cooker’s low, moist heat breaks down the connective tissue in the pork sirloin roast, turning a lean cut into something surprisingly tender and juicy.

The long cooking time allows the flavors of the peppers, onions, and mustard to infuse the meat while the sour cream keeps the sauce creamy and balanced.

The combination of sour cream and whole-grain Dijon mustard creates a sauce that’s simultaneously rich and tangy, with the mustard’s sharpness cutting through the creaminess. The au jus adds depth and a savory note that ties everything together, making every bite deeply satisfying.

Notes and substitutions

Pork sirloin roast is a lean, boneless cut that benefits from slow, moist cooking. If you can’t find it, pork shoulder or butt works beautifully—just expect a slightly longer cooking time.

Choose bell peppers in different colors for a vibrant presentation; red and green are classic, but yellow or orange add sweetness.

Use a good-quality whole-grain Dijon mustard for the best texture and flavor. The coarse grains add a pleasant pop of mustard seed.

The au jus can be store-bought or homemade; if you don’t have it, low-sodium beef broth is a fine substitute. For a thicker gravy, you can stir in a cornstarch slurry at the end.

• pork sirloin roast: pork shoulder or pork butt (increase cooking time by 1-2 hours if needed)
• au jus: low-sodium beef broth or chicken broth (add a splash of Worcestershire for depth)
• whole-grain Dijon mustard: smooth Dijon mustard (the texture will be smoother, but the flavor is similar)
• sweet yellow onion: white onion or Vidalia onion

Equipment

• 6- to 7-quart slow cooker
• Cutting board
• Chef's knife
• Measuring cups
• Measuring spoons
• Serving spoon
• Tongs