Flank Steak With Roasted Garlic Sauce

The smell of roasting garlic fills the whole house, and my husband always wanders into the kitchen asking what's making everything smell so incredible. This flank steak with roasted garlic sauce started as a weekend experiment when I wanted something restaurant-worthy but still doable on a Tuesday.

I made this for my parents' anniversary dinner last fall, and my dad actually went quiet for a full minute after his first bite. That's when I knew this recipe wasn't just good, it was the kind of memorable that people talk about weeks later.

Ingredients

• Flank steak: This cut takes on flavor beautifully and stays tender when you slice it against the grain, plus it's forgiving on the wallet
• Whole garlic bulbs: Roasting transforms sharp raw garlic into something sweet, mellow, and practically spreadable
• Heavy cream: Creates that velvety restaurant-style sauce texture that coats every bite perfectly
• Dijon mustard: Adds just enough subtle sharpness to cut through the richness of the cream and butter

Instructions

Roast the garlic first:

Slice the tops off both garlic bulbs, drizzle with olive oil, wrap in foil, and roast at 400°F for 30 minutes until the cloves are soft and golden brown

Sear the steak hard:

Pat the flank steak completely dry, rub with olive oil, salt, and pepper, then sear in a hot ovenproof skillet for 3 to 4 minutes per side until a gorgeous crust forms

Finish in the oven:

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

Let it rest properly:

Move the steak to a plate and tent loosely with foil for 10 minutes, which lets the juices redistribute so every bite stays incredibly moist

Make the magic sauce:

Squeeze those soft roasted garlic cloves into a saucepan with broth, bring to a simmer, then whisk in cream, butter, Dijon mustard, and lemon juice until smooth and slightly thickened

Slice and serve:

Cut the flank steak thinly against the grain, spoon that gorgeous roasted garlic sauce over the top, and finish with fresh parsley if you're feeling fancy

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This recipe became our go-to for celebrating small wins, like promotions or good news. Something about the combination of perfectly seared meat and that creamy garlic sauce makes regular Tuesday feel special.

Making It Ahead

You can roast the garlic up to two days in advance and store the squeezed cloves in the refrigerator. The sauce comes together in about five minutes when the garlic is already done, which makes weeknight dinners feel luxurious.

Doneness Guide

I use an instant-read thermometer because guessing creates so much unnecessary stress. 125°F is perfect medium-rare, 130°F gives you medium, and remember the temperature keeps rising a few degrees while it rests.

Serving Ideas

Roasted potatoes catch every drop of that garlic sauce, and crisp green beans with lemon balance the richness perfectly. A simple arugula salad with vinaigrette cuts through the fat beautifully.

• Mashed potatoes are never a bad idea here
• Crusty bread for sauce sopping is essential
• A bold red wine like cabernet makes it feel complete

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There's something deeply satisfying about making something this impressive in your own kitchen. Hope it becomes one of those recipes you turn to again and again.

Recipe Q&A

→ How do I know when flank steak is done?

Use a meat thermometer for accuracy: 130-135°F for medium-rare, 140-145°F for medium. The steak will continue cooking slightly while resting. Visual cues include medium-rare having a warm red center and firm but yielding texture.

→ Can I make the garlic sauce ahead?

Yes, roast the garlic bulbs up to 2 days ahead and store in the refrigerator. Complete the sauce preparation just before serving, reheating gently and adding the cream and butter at the end for the freshest flavor.

→ What cut of steak works best?

Flank steak is ideal for its rich beefy flavor and ability to absorb seasoning. Skirt steak or sirloin make excellent substitutes with similar cooking times. Look for bright red meat with minimal connective tissue.

→ How do I slice flank steak properly?

Always slice flank steak thinly against the grain — perpendicular to the long muscle fibers running lengthwise down the meat. This shortens the fibers, ensuring each bite remains tender rather than chewy.

→ What sides pair well with this dish?

Roasted potatoes, garlic mashed potatoes, or creamy polenta complement the sauce beautifully. Steamed green beans, roasted asparagus, or a crisp arugula salad provide fresh contrast. Crusty bread works perfectly for sauce.