Guy Fieri's Knuckle Sandwich Recipe

The Beefy, Over-the-Top Guy Fieri's Knuckle Sandwich You Need to Make Right Now

Let's be real. A sandwich can absolutely be a meal worth planning your whole day around. Not a sad little desk lunch thrown together with whatever's left in the fridge, but a proper, glorious, roll-up-your-sleeves sandwich that makes you stop mid-bite and go, "Wow. Okay. This is the one." That's exactly the energy we're working with today.

Guy Fieri (the self-proclaimed Mayor of Flavortown, Food Network legend, and the man responsible for making flame-patterned bowling shirts a culinary power move) has had his name attached to a sandwich that earns every bit of hype it gets.

The Knuckle Sandwich.

And no, that's not a punch to the face (though your taste buds might feel otherwise). It's a deeply satisfying, slow-roasted beef masterpiece that Guy raved about on Diners, Drive-Ins and Dives when he visited Noble Sandwich Co., calling out the fact that almost everything on it, from the bread to the mustard, is made completely from scratch.

The concept is simple, and the execution is where the magic lives: slow-roasted beef knuckle with a bold dry rub, sweet and jammy caramelized onions, sharp cheddar cheese, and a punchy horseradish sauce, all piled onto crusty homemade bread. It's the kind of sandwich that doesn't apologize for being too much.

That's the whole point.

Let's jump right into it!

What Makes This Sandwich So Special?

First, a quick word on beef knuckle, because it's the star of the show and it deserves some attention. Beef knuckle (sometimes called round tip or sirloin tip) is a lean, flavorful cut from the hindquarter of the cow. It's not the most tender cut straight off the bat, which is exactly why the slow-roasting method works so beautifully here. Low heat, plenty of time, and a good rub transform it into something seriously tender and packed with beefy flavor. It slices beautifully, holds up under the weight of all those toppings, and carries the spice rub like a champ.

The other thing worth talking about is the caramelized onions. Yes, they take time. No, you cannot rush them. Sweet, golden, almost jammy caramelized onions are one of those things that turn a good sandwich into a great one. They add a natural sweetness that plays off the sharpness of the cheddar and the heat of the horseradish sauce in the most satisfying way.

This is what Guy Fieri has always been about: finding food that hits every note at once. Bold, layered, and unapologetically filling.

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Ingredients You'll Need

For the beef knuckle roast

• 2–3 lbs beef knuckle (round tip roast)

• 2 tablespoons olive oil

• 1 tablespoon kosher salt

• 1 teaspoon black pepper

• 1 teaspoon garlic powder

• 1 teaspoon onion powder

• 1 teaspoon smoked paprika

• 1 teaspoon dried thyme

• ½ teaspoon cayenne pepper (adjust to your heat preference)

For the caramelized onions

• 3 large yellow onions, thinly sliced

• 2 tablespoons unsalted butter

• 1 tablespoon olive oil

• 1 teaspoon brown sugar

• Pinch of kosher salt

• 1 tablespoon balsamic vinegar

For the horseradish sauce

• ½ cup mayonnaise

• 2 tablespoons prepared horseradish

• 1 tablespoon Dijon mustard

• 1 teaspoon lemon juice

• Salt and pepper to taste

For assembly

• 4 crusty hoagie rolls or a good sourdough loaf, sliced

• 4–6 slices sharp cheddar cheese

• Butter (for toasting the bread)

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How to Make Guy Fieri's Knuckle Sandwich

Step 1: Make the dry rub and prep the beef.

Take your beef knuckle out of the fridge about 30 minutes before it goes in the oven. You want it to come closer to room temperature so it roasts evenly.

While you wait, mix together the kosher salt, black pepper, garlic powder, onion powder, smoked paprika, thyme, and cayenne in a small bowl. Drizzle the beef with olive oil and rub it all over the surface, getting into every crevice. Don't be shy with the seasoning, because you want that crust to be bold and flavorful.

Preheat your oven to 325°F (165°C).

Step 2: Slow-roast the beef.

Place the seasoned beef knuckle in a roasting pan on a rack. Slide it into the oven and let it go low and slow. Plan on about 1 hour to 1 hour and 15 minutes, or until the internal temperature hits 135–140°F for medium. If you want it more well-done, let it go a little longer to 155°F.

Once it's done, pull it out of the oven and tent it loosely with foil. Let it rest for at least 15–20 minutes before slicing. This step is non-negotiable. Resting lets the juices redistribute through the meat so every slice stays moist and flavorful. Slice it thinly against the grain for the most tender results.

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Step 3: Caramelize the onions.

This is the step that separates a good sandwich from a great one, so set aside about 45 minutes and resist the urge to turn up the heat. Low and slow is the only way to caramelize onions properly. If you crank the heat, you'll end up with burnt onions instead of sweet golden ones.

In a large skillet over medium-low heat, melt the butter with the olive oil. Add the sliced onions and a pinch of salt, and stir to coat. Let them cook slowly, stirring every 5–10 minutes.

After about 30 minutes they'll be golden and soft. Add the brown sugar and balsamic vinegar, stir well, and let them cook for another 10–15 minutes until they're deep amber in color, jammy, and incredibly fragrant. Take them off the heat and set them aside.

Step 4: Mix the horseradish sauce.

This one takes all of two minutes. Combine the mayonnaise, prepared horseradish, Dijon mustard, and lemon juice in a small bowl. Give it a taste. If you want more heat, add more horseradish.

Season with salt and pepper, then refrigerate until you're ready to assemble. This sauce can be made a day ahead and it only gets better as it sits.

Step 5: Toast the bread.

Butter the cut sides of your rolls generously and toast them face-down in a skillet or griddle over medium heat until they're golden brown and slightly crispy.

Don't skip the toasting. It creates a barrier that keeps the bread from getting soggy under all those juicy toppings, and that little bit of crunch is a complete game-changer.

Step 6: Assemble the knuckle sandwich.

Now for the best part. Slather a generous layer of horseradish sauce on both sides of the toasted bread. Lay down a pile of the thinly sliced roast beef on the bottom half, then top it with the caramelized onions.

Lay the cheddar cheese slices over the onions, and if you want the cheese properly melted, slide the open sandwich under the broiler for a minute or two until it's bubbly and gooey. Close it up, press it gently, and either slice it in half or hand it over whole to someone who deserves it.

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Tips for Getting It Right

Getting to great results with this sandwich is all about patience and not cutting corners on the key steps. Always rest the beef after roasting. Slice it thin and against the grain for maximum tenderness. Make the caramelized onions the day before if you want to save time on the day you serve; they reheat beautifully in a pan with a splash of water.

For the bread, a crusty hoagie roll or a rustic sourdough are both excellent choices. You want something sturdy enough to hold up to the weight of the filling without falling apart, but not so tough that it's a jaw workout.

The horseradish sauce is totally adjustable too. If you're serving people who don't love heat, dial back the horseradish and add a little extra mayo. If you're cooking for spice lovers, go wild and add a pinch of cayenne to the sauce as well.

The Flavortown Verdict

This sandwich is everything Guy Fieri stands for in the kitchen: big flavors, quality ingredients, and a genuine love for food that makes people feel good. The slow-roasted beef knuckle is tender and deeply savory, the caramelized onions bring that sweet depth, the sharp cheddar adds richness, and the horseradish sauce ties it all together with a little kick.

It takes some time, yes. But good sandwiches always do. And once you take that first bite, the one where all those layers come together at once, you'll completely understand why Guy couldn't stop talking about it.

That right there is a proper knuckle sandwich. And it's absolutely worth every minute.

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