Rosemary-Mustard Pork Tenderloin with Maple-Onion Jam

I am a major sauce fan. The sweet onion jam really made this dish special. The meat was also loaded with flavor from the rosemary-mustard-garlic seasoning. I served it with maple syrup roasted acorn squash, and roasted gold and sweet potatoes, carrots, and kohlrabi. It was a weeknight feast.

This recipe was adapted from Antoni in the Kitchen by Antoni Porowski. I increased the amount of garlic and substituted apple cider for bourbon in the onion jam. Delicious.

Yield: Serves 4

For the Maple-Onion Jam:

  • 2 T unsalted butter
  • 1 T olive oil
  • 1 1/2 to 2 pounds red onions, cut into 1/4-inch pieces (about 4 1/2 cups)(I used 2 large onions)
  • Kosher salt
  • 1/3 cup pure maple syrup
  • 1/4 cup fresh apple cider or bourbon
  • 1/2 tsp freshly ground black pepper

For the Rosemary-Mustard Pork Tenderloin:

  • 4 to 8 large garlic cloves, thinly sliced
  • Kosher salt
  • 2 T grainy or creamy Dijon mustard
  • 1 T plus 1 tsp finely chopped fresh rosemary
  • freshly ground black pepper
  • 1 T plus 2 tsp olive oil, divided
  • 2 (1 to 1 1/4-pound) pork tenderloins
  • 1 T unsalted butter

To Make the Maple-Onion Jam:

  1. In a large heavy skillet, heat the butter and oil over medium heat until the butter is melted. (I used a stainless steel sauté pan.)
  2. Add the onions and 1/4 tsp salt, reduce the heat to medium-low, and cook, stirring frequently, until the onions are very tender and sweet, 30 to 35 minutes.
  3. Add the maple syrup and cider (or bourbon), increase the heat to medium, and cook, stirring occasionally, until the liquid has evaporated and the onions are jammy, about 7 to 10 minutes. Watch carefully and lower the heat if necessary.
  4. Remove from the heat and stir in pepper and 1/4 tsp salt. Adjust seasoning to taste.
  5. Serve warm or at room temperature.

Note: The jam can be made ahead, cooled, covered, and refrigerated for up to 2 weeks.

To Make the Rosemary-Mustard Pork Tenderloin:

  1. While the jam cooks, mound the sliced garlic with 1 teaspoon salt on a cutting board. Using a chef’s knife, mash and chop into a paste.
  2. Transfer garlic to a small bowl. Stir in the mustard, rosemary, 1/2 tsp pepper, and 2 tsp olive oil.
  3. With a paring knife or kitchen shears, make 12 x-shaped incisions, about 1/8-inch deep, all over each tenderloin.
  4. Rub the tenderloin all over with the garlic mixture, stuffing bits into the incisions.
  5. With a rack in the center, heat the oven to 425 degrees, preferably on convection roast. (This temperature is ideal for roasting vegetables at the same time.)
  6. In a large oven proof skillet, heat the butter and remaining tablespoon olive oil over medium-high heat until the butter is melted and foamy. (I used a 12-inch cast iron skillet.)
  7. Add the tenderloins and cook until browned on the bottom, about 5 to 7 minutes.
  8. Turn browned side up and transfer the skillet to the preheated oven. Roast until an instant-read thermometer inserted into the thickest part of the pork reads 135 degrees, about 15 to 20 minutes. (I used the oven probe.)
  9. Transfer to a cutting board and let rest for 10 minutes.
  10. Cut the pork into thick slices and serve with the onion jam.

About Josette@thebrookcook

I live in Stony Brook, New York on Long Island. I love garlic and baking. My hobby (and love) is to try new recipes. My favorite recipe resources include The New York Times, Food and Wine, Bon Appetit, and Martha Stewart Living. Enjoy!

4 responses to “Rosemary-Mustard Pork Tenderloin with Maple-Onion Jam

  1. Mmmm, I find onion jam simply marvelous. 🍁🍂🌾

  2. Mom

    Have to try this yummy recipe.

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