Oven Baked Pork Tenderloin with Apples and Onions

The juiciest pork tenderloin you'll ever taste, nestled in caramelized apples and onions with a sweet-savory glaze—ready in under an hour and beautiful enough for company.

There’s a moment, right around the time the apples start to soften and the onions turn translucent, when the kitchen smells like autumn decided to throw a dinner party. That’s the moment I know this oven-baked pork tenderloin is about to become the star of the evening. My family started making this dish when we moved to New England and suddenly found ourselves surrounded by orchards heavy with Honeycrisps and Macouns. We wanted a recipe that felt celebratory enough for Sunday supper yet simple enough for a Tuesday night when homework folders are spilling across the table and someone still needs a practice spelling test. This is that recipe.

Over the years I’ve tweaked the glaze dozens of times—sometimes adding a splash of bourbon for depth, sometimes swapping in maple syrup when we’ve run out of brown sugar—but the core remains unchanged: a whole pork tenderloin, quickly seared, then roasted alongside apples and onions until everything is glossy and golden. The fruit soaks up the savory juices; the pork stays blush-pink and impossibly tender. If you can peel an apple and wield a cast-iron skillet, you can master this dish. And once you do, it will become your back-pocket answer to “What should I cook when the in-laws come?” or “What’s for dinner that isn’t chicken again?”

Ingredients You'll Need

Quality ingredients make this simple dish sing. Start with a pork tenderloin—not a pork loin; the tenderloin is smaller, darker, and more tender. Look for one that’s pinkish-red with minimal surface liquid; avoid anything pale or sitting in a puddle. If your market sells them in two-packs, you can double the recipe—leftovers reheat beautifully in a skillet with a splash of broth.

For apples, choose varieties that hold their shape: Honeycrisp, Braeburn, or Pink Lady. They’ll soften but won’t turn to applesauce, creating those jammy pockets that pair so well with pork. A mix of sweet and tart is ideal; if you only have Granny Smiths, add an extra teaspoon of brown sugar to balance their bite.

Yellow onions caramelize faster than red and are cheaper than sweet Vidalias, but any onion works. Slice them pole-to-pole so they stay in crescents and don’t disappear into the juices.

The glaze is a simple reduction of apple cider, brown sugar, Dijon mustard, and a pat of butter. Use fresh cider if you can find it; the bottled shelf-stable kind is fine in a pinch but reduce the sugar slightly. Dark brown sugar adds molasses depth; light brown is milder. Whole-grain Dijon gives pops of mustard seed, but smooth Dijon yields a silkier sauce.

Finally, keep a knob of cold butter on standby. Whisking it into the hot glaze just before serving creates restaurant-style body and gloss. If you’re dairy-free, substitute olive oil, but the texture will be thinner.

How to Make Oven Baked Pork Tenderloin with Apples and Onions

Expert Tips

Variations to Try

• Pear & Sage: Swap apples for firm pears and thyme for chopped fresh sage. Use white balsamic in place of cider.
• Asian-Inspired: Sub soy sauce for half the salt, add 1 tsp grated ginger to the glaze, and finish with toasted sesame seeds.
• Spicy Kick: Stir ¼ tsp cayenne and 1 Tbsp honey into the glaze; serve with pickled jalapeños on the side.
• Autumn Harvest: Add 1 cup cubed butternut squash to the skillet; it roasts in the same time as the apples.
• Double Mustard: Use both Dijon and whole-grain mustard for texture; add 1 tsp mustard powder to the seasoning blend.

Storage Tips

Sliced leftovers keep up to 4 days in an airtight container. Refrigerate apples/onions and pork together so the fruit continues to flavor the meat. Reheat gently: place slices in a skillet with a splash of broth, cover, and warm over medium-low 4 minutes. Avoid the microwave—it tightens the pork.

To freeze, cool completely, then layer slices and apples in a freezer-safe bag with as much air removed as possible. Freeze up to 2 months. Thaw overnight in fridge, then reheat as above. The sauce may separate; whisk in a tiny knob of butter to bring it back together.

If you want to prep ahead, season the tenderloin up to 24 hours early. You can also slice apples and onions the morning of; store submerged in lightly salted water with a squeeze of lemon to prevent browning. Drain and pat dry before cooking.

Frequently Asked Questions

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Oven Baked Pork Tenderloin with Apples and Onions

(4.9 from 127 reviews)

Prep

15 min

Cook

25 min

Servings

4

Ingredients

• 1 pork tenderloin (1–1.2 lb)
• 1 tsp kosher salt
• ½ tsp freshly ground black pepper
• ½ tsp dried thyme
• 1 Tbsp neutral oil (avocado or canola)
• 1 Tbsp unsalted butter, divided
• 1 large yellow onion, sliced pole-to-pole
• 2 firm apples (Honeycrisp or Braeburn), cut into ¾-inch wedges
• ½ cup fresh apple cider
• 2 Tbsp dark brown sugar
• 1 Tbsp Dijon mustard
• ¼ tsp ground cinnamon
• Optional: fresh thyme or parsley for garnish

Instructions

1. Preheat & Season: Heat oven to 425 °F. Pat tenderloin dry; season with salt, pepper, and thyme.
2. Sear: Heat oil in a 12-inch oven-safe skillet over medium-high. Sear pork 2 minutes per side until golden. Transfer to plate.
3. Sauté: Add ½ Tbsp butter to same skillet. Cook onions 3 minutes; add apples and a pinch of salt, cook 2 minutes.
4. Glaze: Stir in cider, brown sugar, Dijon, and cinnamon; simmer 1 minute.
5. Roast: Return pork to skillet; spoon some glaze over top. Roast 12–15 minutes until 140 °F internally.
6. Rest & Finish: Transfer pork to board; tent with foil. Simmer pan sauce 2 minutes; whisk in remaining ½ Tbsp cold butter. Slice pork and serve over apples/onions with sauce spooned on top.

Recipe Notes

Leftovers refrigerate up to 4 days or freeze 2 months. Reheat gently in a covered skillet with a splash of broth to keep juicy.

Nutrition (per serving)

318

Calories

36g

Protein

22g

Carbs

9g

Fat