Herb-Crusted Beef Sirloin with Garlic-Infused Butter

By AislePrompt Editorial · Published 2026-04-06 · Updated 2026-04-06

A quick, high-protein beef dish with aromatic herbs and rich garlic butter, perfect for keto meal prep. This American-inspired beef recipe (high-protein, low-carb), ready in about 25 minutes, pairs flank steak, avocado oil, garlic cloves for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 485 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

• 8 oz flank steak
• 2 tbsp avocado oil
• 3, minced garlic cloves
• 2 tbsp, finely chopped fresh rosemary
• 1/4 cup unsalted butter
• 1 tsp kosher salt
• 1/2 tsp black pepper

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Instructions

1. Step 1: Pat 8 oz flank steak dry with paper towels, then season evenly with 1 tsp kosher salt and 1/2 tsp black pepper on both sides.
2. Step 2: Heat 2 tbsp avocado oil in a cast-iron skillet over medium-high heat until shimmering, then add the seasoned steak and sear for 3 minutes per side until golden brown and crispy edges form.
3. Step 3: Reduce heat to medium, add 3 minced garlic cloves and 2 tbsp fresh rosemary, cooking for 1 minute until fragrant and garlic turns golden but not brown.
4. Step 4: Add 1/4 cup unsalted butter to the skillet, swirling to melt, and continue cooking for 2 more minutes while basting the steak with the garlic butter until the butter is foamy and the steak reaches 130°F for medium-rare.