Keto Herb-Crusted Beef Tenderloin with Garlic-Butter Sauce

By AislePrompt Editorial · Published 2026-04-05 · Updated 2026-04-05

A succulent beef tenderloin coated in aromatic herbs, seared to perfection with a rich garlic-herb butter sauce that melts into the meat. This American-inspired beef recipe (keto, high protein), ready in about 45 minutes, pairs grass-fed beef tenderloin, avocado oil, garlic cloves for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 580 calories and feeds 4, so it slots cleanly into a low-carb week and pairs well with cauliflower rice or roasted green vegetables. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 1.5 lbs grass-fed beef tenderloin
• 2 tbsp avocado oil
• 4, minced garlic cloves
• 1 tbsp, finely chopped fresh rosemary
• 1 tbsp, finely chopped fresh thyme
• 3 tbsp unsalted butter
• 1 tsp sea salt
• 1/2 tsp black pepper

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Instructions

1. Step 1: Pat 1.5 lbs grass-fed beef tenderloin dry with paper towels, then season evenly with 1 tsp sea salt and 1/2 tsp black pepper. Press 1 tbsp fresh rosemary and 1 tbsp fresh thyme firmly onto all sides of the beef.
2. Step 2: Heat 2 tbsp avocado oil in a heavy oven-safe skillet over medium-high heat until shimmering (about 1 minute). Sear the seasoned beef for 2 minutes per side until deeply browned, then transfer the skillet to a preheated 400°F (200°C) oven and roast for 12-14 minutes until the internal temperature reaches 125°F (52°C) for medium-rare.
3. Step 3: Remove the skillet from the oven, transfer the beef to a cutting board, and tent loosely with foil to rest for 10 minutes. While resting, melt 3 tbsp unsalted butter in the skillet over medium heat, add 4 minced garlic cloves, and cook for 1 minute until fragrant and golden, stirring constantly to prevent burning.