Pan-Seared Beef Steak with Caramelized Onion and Fresh Herbs

By AislePrompt Editorial · Published 2026-04-09 · Updated 2026-04-09

Perfectly seared beef steaks with deeply caramelized onions and a fragrant herb finish for an elegant dinner. This American-inspired beef recipe (keto, low-carb), ready in about 30 minutes, pairs beef sirloin steaks, yellow onion, butter for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 452 calories and feeds 2, 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

• 2, 6 oz each beef sirloin steaks
• 1 medium, thinly sliced yellow onion
• 2 tbsp butter
• 1 tbsp olive oil
• 2 tbsp, chopped fresh parsley
• 1 tbsp, leaves fresh thyme
• 1/2 tsp salt
• 1/4 tsp black pepper

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Instructions

1. Step 1: Pat 2 beef sirloin steaks (6 oz each) dry with paper towels, then season both sides with 1/2 tsp salt and 1/4 tsp black pepper.
2. Step 2: Heat 1 tbsp olive oil in a heavy skillet over medium-high heat until shimmering.
3. Step 3: Add steaks and cook 4 minutes per side for medium-rare (internal temperature 130°F), then transfer to a plate.
4. Step 4: Melt 2 tbsp butter in the same skillet over medium heat, add 1 medium yellow onion (thinly sliced), and cook 12-15 minutes, stirring occasionally, until golden brown and caramelized.
5. Step 5: Stir in 2 tbsp fresh parsley and 1 tbsp fresh thyme, cooking 1 minute until fragrant.
6. Step 6: Return steaks to skillet, spoon onion mixture over them, and cook 1 minute to reheat before serving.