Flank Steak With Roasted Garlic Sauce

My apartment smelled like a French bistro for three days after I first attempted roasted garlic sauce. The cloves had caramelized into this sticky, golden paste that I was tempted to eat straight from the bulb with a spoon.

I made this for my dads birthday last winter. He took one bite, closed his eyes, and didnt say anything for a full minute which is basically his version of a standing ovation. Now he requests it every time he visits.

Ingredients

• Flank steak: This lean cut develops incredible flavor when seared hard and finished in the oven. Pat it completely dry before seasoning so it forms a proper crust.
• Garlic bulbs: Two whole bulbs might seem excessive but roasting mellows the sharpness into something sweet and nutty. Dont be shy about squeezing every last clove out.
• Heavy cream: This is what transforms the roasted garlic into actual sauce rather than just flavorful garlic broth. The richness balances the sharp lemon and mustard perfectly.
• Dijon mustard: Just a teaspoon adds a bright counterpoint to all that creamy richness. Use a good quality one with some actual bite to it.

Instructions

Roast the garlic first:

Preheat your oven to 400°F and slice the tops off both garlic bulbs. Drizzle with olive oil, wrap them in foil, and let them roast for 30 minutes until the cloves are soft and golden.

Prep the steak:

Pat the flank steak completely dry with paper towels. Rub it all over with olive oil then season generously with kosher salt and freshly ground black pepper.

Sear it hard:

Heat an ovenproof skillet over medium-high heat until its smoking slightly. Sear the steak for 3 to 4 minutes per side until a deep brown crust forms.

Finish in the oven:

Transfer the skillet directly into the 400°F oven. Roast for 6 to 8 minutes for medium-rare, adjusting slightly longer or shorter depending on your preference.

Let it rest:

Move the steak to a plate and tent loosely with foil. Rest for a full 10 minutes. This step feels like forever but the juices will redistribute throughout the meat.

Build the sauce:

Squeeze those roasted garlic cloves into a small saucepan. Add the broth and bring to a simmer over medium heat, whisking constantly to break up the garlic.

Add the richness:

Pour in the heavy cream, butter, Dijon mustard, and lemon juice. Simmer gently for 2 to 3 minutes, whisking until the sauce smooths out and thickens slightly. Season with salt and pepper.

Slice and serve:

Cut the flank steak thinly across the grain. Arrange on plates and spoon that roasted garlic sauce generously over the top. Sprinkle with fresh parsley if you want it to look pretty.

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This recipe turned a random Tuesday into something worth remembering. Sometimes food is just food but other times it turns an ordinary evening into a tiny celebration.

Getting That Restaurant Sear

Most home cooks make the mistake of flipping their steak too soon or not letting their pan get hot enough. You want to hear a sizzle the moment the meat hits the skillet. If it sounds like a whisper instead of a shout, your pan isnt ready yet.

Making It Your Own

Fresh thyme or rosemary added to the sauce during the last minute of simmering adds a lovely aromatic layer. A splash of white wine instead of some of the broth creates a slightly brighter, more elegant sauce that pairs beautifully with the beef.

What To Serve Alongside

Mashed potatoes soak up that roasted garlic sauce like nothing else. Roasted vegetables with crispy edges work just as well if you want something lighter. A simple green salad with sharp vinaigrette cuts through all the richness.

• Crusty bread is basically mandatory for wiping the plate clean
• A bold red wine like Cabernet or Malbec stands up to the beef
• Leftover sauce keeps in the fridge for three days and is incredible over scrambled eggs

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Hope this recipe finds its way into your regular rotation. Some dishes just belong in your permanent collection.

Recipe FAQs

→ How do I know when flank steak is done?

Use a meat thermometer to check internal temperature. For medium-rare, aim for 130-135°F (54-57°C). The steak will continue cooking slightly while resting. Remember that flank steak tastes best when cooked to medium-rare or medium — going beyond medium can make it tough.

→ Can I prepare the roasted garlic sauce ahead?

Yes, roast the garlic bulbs up to 2 days in advance and store them in the refrigerator. When ready to serve, simply squeeze the cloves into a saucepan, add the remaining ingredients, and warm through. You may need to add a splash more broth if the sauce seems too thick after refrigerating.

→ What cut of steak works best for this dish?

Flank steak is ideal for its robust flavor and ability to absorb seasonings. However, skirt steak or sirloin make excellent substitutes. Look for a piece with good marbling and a uniform thickness of about 1 inch for even cooking. Ask your butcher to trim any excess connective tissue if needed.

→ Why should I slice flank steak against the grain?

Slicing against the grain (perpendicular to the muscle fibers) shortens the muscle fibers, making each bite noticeably more tender. Flank steak has long, distinct muscle fibers running in one direction — look for the lines and cut across them rather than parallel. This simple technique transforms the texture completely.

→ How can I make the sauce lighter?

Replace heavy cream with half-and-half or whole milk for a lighter version, though the sauce will be less thick. You can also omit the butter or use just 1 tablespoon instead of 2. The roasted garlic provides plenty of body and flavor on its own, so the sauce remains satisfying even with reduced dairy.

→ What sides pair well with this steak?

Roasted potatoes or smashed fingerlings complement the rich sauce beautifully. Steamed green beans, asparagus, or Brussels sprouts add fresh contrast. A crisp arugula salad with lemon vinaigrette helps cut through the richness. For a heartier meal, serve with creamy mashed potatoes or crusty bread to soak up extra sauce.