Roasted Beef with Caramelized Onions and Herb Butter
Prep
20 mins
Cook
45 mins
Servings
4
Difficulty
Medium
This is one of my favorite dishes to make when I want something elegant but honestly pretty straightforward. Tender beef tenderloin paired with sweet caramelized onions and a luxurious herb butter creates a restaurant quality meal that comes together in just about an hour. The best part? You probably have most of these ingredients already, which keeps costs down while impressing everyone at your table. Fresh herbs like thyme and rosemary aren't just delicious, they're packed with antioxidants that support overall wellness. It's the kind of dinner that feels fancy enough for special occasions but simple enough for a regular weeknight when you want to treat yourself really well.
Ella x
Ingredients
- ¾ kgbeef tenderloin(trimmed of excess fat)
- 4 largeyellow onions(sliced into thick rings)
- 3 tbspolive oil
- 4 tbspunsalted butter(divided)
- 3 sprigsfresh thyme
- 2 sprigsfresh rosemary
- 4garlic cloves(minced)
- 1½ tspsea salt
- 1 tspblack pepper(freshly ground)
- 2 tbspbalsamic vinegar
- 118 mlbeef broth
- 1 tbspdijon mustard
Detail level
Instructions
- 1
Preheat oven to 425°F. Pat the beef tenderloin dry with paper towels and season generously on all sides with salt and pepper.
Tip: Dry meat ensures better browning and a flavorful crust.
- 2
Heat olive oil in a large oven-safe skillet over medium-high heat. Once shimmering, sear the beef for 3-4 minutes per side until golden brown, then transfer to a plate.
Tip: Don't move the meat while searing to develop a proper crust.
- 3
In the same skillet, add 2 tablespoons of butter and the sliced onions. Cook over medium heat for 12-15 minutes, stirring occasionally, until onions are soft and deeply golden.
Tip: Lower heat if onions brown too quickly to achieve caramelization rather than burning.
- 4
Stir in the minced garlic and cook for 1 minute until fragrant, then deglaze the pan with balsamic vinegar, scraping up any browned bits from the bottom.
Tip: Deglazing adds depth and prevents the pan from drying out.
- 5
Return the beef to the skillet, nestling it among the onions. Add thyme and rosemary sprigs, then transfer the entire skillet to the preheated oven.
Tip: Use an oven-safe skillet for seamless transition from stovetop to oven.
- 6
Roast for 18-25 minutes for medium-rare (internal temperature of 130-135°F), or adjust time based on desired doneness.
Tip: Use a meat thermometer inserted into the thickest part for accuracy.
- 7
Remove from oven and let the beef rest for 5 minutes. Mix remaining 2 tablespoons of butter with dijon mustard and fresh herbs, then dollop on top of the beef.
Tip: Resting allows juices to redistribute, keeping the meat tender and juicy.
- 8
Pour beef broth into the pan around the beef and onions, then serve immediately with the caramelized onions and pan juices spooned over each portion.
Tip: The pan juices create a delicious sauce that complements the herb butter perfectly.
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