Fennel-Roasted Pork Tenderloin With Sweet Onions Recipe

Kerry Saretsky

An easy, impressive holiday dinner for two. Start by roasting fennel and red onions in some olive oil. While they are starting to get soft and sweet, roll the pork tenderloin in a mixture of salt, pepper, fennel seeds, and fresh thyme. Then, simply plop the pork in the same roasting pan as the vegetables, and let the whole thing finish off together. It's ready in one hour, in one pan, plus a few leftovers which make a killer sandwich the next day. A drizzle of olive oil and balsamic over the top seals the deal.

Recipe Facts

Active: 10 mins
Total: 60 mins
Serves: 2 to 3 servings

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  • 2 medium bulbs fennel, cut into sixths

  • 2 medium red onions, cut into sixths

  • 3 tablespoons plus 2 teaspoons olive oil, divided

  • Kosher salt and freshly ground black pepper

  • 2 tablespoons fennel seeds

  • 2 tablespoons fresh thyme

  • 1 whole pork tenderloin (1 to 1 1/4 pounds)

  • 1 tablespoon balsamic vinegar


  1. Adjust rack to middle position and place an empty 13- by 9-inch baking dish in the middle. Preheat the oven to 425°F.

  2. In a large bowl, toss fennel, onions, 1 tablespoon of olive oil, and salt and pepper to taste. When the oven is hot, remove the baking dish, add the vegetables, and return to oven. Roast, stirring occasionally, until starting to tenderize, about 30 minutes.

  3. Meanwhile, drizzle 2 teaspoons of olive oil over pork and season with salt and pepper. Rub fennel seeds and thyme leaves on exterior. When vegetables are ready, remove baking dish from oven, and push the vegetables to the sides of the dish with a spatula or wooden spoon. Place the pork in the center and return to oven. Roast until the thickest part of the pork registers 145°F on an instant-read thermometer. Remove from oven and allow to rest for 10 minutes.

  4. While the pork is resting, whisk together remaining 2 tablespoons of olive oil and 1 tablespoon of balsamic vinegar. Slice the pork into thick rounds, and plate along with the roasted fennel and onion. Drizzle the olive oil and vinegar over the top. Serve immediately.

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Nutrition Facts (per serving)
442 Calories
23g Fat
19g Carbs
40g Protein
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Nutrition Facts
Servings: 2 to 3
Amount per serving
Calories 442
% Daily Value*
Total Fat 23g 30%
Saturated Fat 4g 22%
Cholesterol 103mg 34%
Sodium 958mg 42%
Total Carbohydrate 19g 7%
Dietary Fiber 5g 18%
Total Sugars 8g
Protein 40g
Vitamin C 16mg 81%
Calcium 117mg 9%
Iron 3mg 19%
Potassium 1103mg 23%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)