Ingredients for Jamie Oliver’s Ultimate Steak Sandwich

• 1 (minimum 14 oz) flank or skirt steak: The hero of the sandwich, chosen for its lean tenderness when cooked correctly.
• 2 sprigs rosemary, (optional, but highly recommended): Adds an aromatic, earthy note that beautifully complements beef.
• 2 large onions: These are the true stars, transforming into sweet, savory, and sticky layers.
• 5 fresh bay leaves: Infuse the onions with a subtle, fragrant warmth.
• 1 1/2 tablespoons (3/4 oz) unsalted butter: For richness and aiding in the caramelization process.
• 1 1/2 tablespoons extra-virgin olive oil, plus more for drizzling: Essential for cooking and finishing.
• 1/3 cup dark brown sugar: Crucial for achieving that deep, sweet caramelization in the onions.
• Sea salt: To season the steak and onions, bringing out their natural flavors.
• Freshly ground black pepper: For a touch of spice and aroma.
• 1/2 cup red wine vinegar: Adds a vital tangy counterpoint to the sweet onions, creating a gastrique-like glaze.
• 1 loaf ciabatta: A crusty, airy bread that perfectly soaks up juices without becoming soggy. Make your own ciabatta for the ultimate experience!
• English mustard, such as Colman’s (optional, but adds a fantastic kick): Provides a sharp, spicy contrast that cuts through the richness. Find Colman’s Mustard here.
• 1/2 lemon: A squeeze of fresh lemon brightens the watercress and lifts the overall flavor profile.
• 1 handful watercress: Offers a fresh, peppery bite and a vibrant green crunch.

Step-by-Step Instructions to Craft Your Ultimate Steak Sandwich

1. Prepare the Steak for Even Cooking

   Begin by removing your flank or skirt steak from the refrigerator. Place it on a piece of parchment paper on your counter. Allow the steak to rest at room temperature for approximately 30 minutes. This seemingly small step is crucial; it ensures the steak cooks more evenly from edge to center, resulting in a more tender and juicy final product. This also prevents the meat from seizing up when it hits the hot pan.

2. Master the Caramelized Onions: The Heart of the Sandwich

   While your steak is resting, turn your attention to the onions. Carefully peel them, removing not only the papery outer skin but also the very first translucent layer of onion (you can reserve these for making flavorful chicken or vegetable stock later). Slice the remaining onion into substantial 3/4-inch-thick rounds. In a large frying pan or a sturdy cast-iron skillet, add the fresh bay leaves, unsalted butter, a generous “glug” of olive oil (about 1 1/2 tablespoons), and the dark brown sugar. Place the pan over medium heat. Once the butter has melted and is bubbling gently, arrange the onion rounds in a single layer. Season them generously with sea salt and freshly ground black pepper. Cook the onions undisturbed for about 5 minutes, allowing them to soften and begin to brown.

   Next, pour in the red wine vinegar. Immediately cover the pan with a tight-fitting lid, reduce the heat to low, and let the onions gently simmer and cook for around 35 minutes. The goal here is to achieve a beautiful, deep golden caramelization on the bottom of the onions, developing an incredible sweet and savory depth. Periodically check on them; if they seem too dry or are sticking to the pan, add small splashes of water to loosen them and prevent burning. Once the onions have reached this glorious state, remove and discard the bay leaves, if desired, as their flavor has already been imparted. These onions are the secret weapon of this sandwich!

3. Warm the Ciabatta to Perfection

   As the onions are working their magic, preheat your oven to a gentle 225ºF (107°C). Place the ciabatta loaf directly into the warm oven. Allow it to heat through until it’s wonderfully soft and yielding on the inside with a delicately crisp crust. This typically takes about 10-15 minutes, depending on the size and freshness of your bread. A warm loaf is essential for the ultimate sandwich experience.

4. Tenderize and Sear the Steak for Maximum Flavor

   Now, back to your steak. If you’re using rosemary, place one sprig beneath the steak and another sprig directly on top. Cover the steak with a fresh sheet of parchment paper. Using the bottom of a heavy pan (like a cast-iron skillet), gently but firmly bash the steak. This action helps to tenderize the meat and ensures it has a roughly uniform thickness throughout, promoting even cooking. Once pounded, season the steak generously all over with sea salt and freshly ground black pepper.

   Heat a large nonstick, heavy-bottomed skillet over medium-high heat. Wait until the skillet is screaming hot—you should see wisps of smoke just beginning, but it shouldn’t be overtly smoking. Drizzle the seasoned steak with a little olive oil, then carefully place it in the hot skillet. Cook for about 3 minutes on each side for a perfect medium doneness. Adjust the cooking time based on your preference: slightly less for rare, a bit more for medium-well or well-done. Once cooked to your liking, transfer the steak to a clean plate and let it rest for at least 1 minute. Resting allows the muscle fibers to relax and reabsorb the juices, ensuring a tender and moist steak. After resting, slice the steak across the grain into 1/2-inch-thick pieces. Toss these flavorful slices with any accumulated resting juices from the plate and an additional drizzle of fresh olive oil to enhance their flavor and sheen.

5. Assemble Your Masterpiece: The Jamie Oliver Way

   Take your warmed ciabatta loaf and cut it in half lengthwise. Rub the cut sides of the bread generously with the savory juices that have collected from the resting steak—this adds an incredible depth of flavor right into the bread. If you’re a fan of a good kick, spread a layer of English mustard (or your chosen spicy alternative) onto both halves of the ciabatta.

   On the bottom half of the ciabatta, begin layering your masterpiece: first, a generous mound of the deeply caramelized onions. Follow this with the perfectly cooked and sliced steak. Finally, add a handful of fresh watercress, lightly dressed with a squeeze of lemon juice. The lemon will cut through the richness and add a lovely brightness. Carefully place the top half of the ciabatta over the fillings, pressing down lightly to meld the flavors. Carve the sandwich into decent, generous chunks—this is a sandwich meant to be shared, or fiercely guarded! Now, “get involved” and enjoy every glorious bite of Jamie Oliver’s ultimate steak sandwich.

Chef’s Notes & Expert Substitutions

This recipe offers flexibility, but here are some insights and alternatives to ensure your steak sandwich is always a triumph:

*What can I use instead of flank steak?

Jamie Oliver’s recipe is designed specifically for flank steak, a cut known for its robust beefy flavor and texture that becomes wonderfully tender when sliced against the grain. It will, without a doubt, provide the best results. However, if flank steak isn’t available, a slab of skirt steak makes an excellent alternative. Both flank and skirt steak are leaner cuts that benefit from similar preparation methods, including tenderizing and quick searing. Another viable option is chuck steak, which can also yield a delicious sandwich, provided it is sliced very thinly and always across the grain to ensure maximum tenderness. Remember that subtle variations in texture and fat content might slightly alter the final outcome, so adjust cooking times accordingly.

The Power of Rosemary (Don’t Skip It!)

While the recipe lists rosemary as optional, our recipe testers strongly urge you not to skip it. The fragrant sprigs, when placed with the steak during the tenderizing and cooking process, impart a subtle yet distinct herbaceous character that truly elevates the flavor of the beef. It adds an aromatic depth that ties all the rich flavors together.

Mustard Matters: Finding Your Kick

English mustard, like Colman’s, is known for its intense, spicy kick. This pungency is crucial for cutting through the richness of the steak and the sweetness of the caramelized onions, creating a balanced flavor profile. If Colman’s isn’t accessible, a high-quality Dijon mustard with a noticeable horseradish component makes an excellent substitute. Aim for a mustard that offers a sharp, vibrant heat to mimic the intended effect.

Watercress: A Fresh Perspective

The peppery freshness of watercress, especially when brightened with a squeeze of lemon, is designed to provide a crucial counterpoint to the savory and sweet elements of the sandwich. If watercress is unavailable, peppery arugula can serve as a substitute. However, some testers found the sandwich most enjoyable with watercress or without any greens at all, highlighting the unique contribution of watercress’s distinct flavor and crunch. If you can find it, it’s worth the effort!

Make Ahead Tip: Caramelized Onions

The caramelized onions are fantastic and can easily be made ahead of time. Prepare a larger batch on a Sunday and store them in an airtight container in the refrigerator for up to 3-4 days. This makes assembling this gourmet steak sandwich a breeze on a busy weeknight.

Adapted From

This remarkable recipe is expertly adapted from Jamie Oliver’s “Comfort Food,” a collection of his most cherished and satisfying dishes that celebrate the joy of home cooking and hearty meals.

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