This Wagyu steak sandwich is the ultimate indulgence, featuring thinly sliced, richly marbled Wagyu beef seared to a perfect medium-rare and piled onto crusty bread with caramelized onions, melted cheese, and a zesty horseradish cream. The high fat content of Wagyu makes it incredibly tender and flavorful, so it needs only simple seasonings and quick cooking to shine. It’s a restaurant-quality meal that comes together in under 30 minutes, perfect for a special lunch or a decadent dinner.
Ingredients
- 1 lb (450 g) Wagyu beef (ribeye or striploin), thinly sliced
- 2 tbsp (30 ml) neutral oil (like canola or grapeseed), divided
- 1 large yellow onion, thinly sliced
- 1 tsp (5 g) sugar
- Salt and freshly ground black pepper, to taste
- 4 slices provolone or Swiss cheese (about 4 oz / 115 g total)
- 2 crusty rolls (like ciabatta or baguette), split
- 2 tbsp (30 g) butter, softened
- For the horseradish cream:
- 1/2 cup (120 ml) sour cream
- 2 tbsp (30 g) prepared horseradish, drained
- 1 tsp (5 ml) Dijon mustard
- 1 tsp (5 ml) lemon juice
- Salt and pepper, to taste
Instructions
- Prep the beef: If your Wagyu isn’t already thinly sliced, place it in the freezer for 15-20 minutes to firm up, then slice against the grain into 1/8-inch (3 mm) thick pieces. Pat dry with paper towels and season generously with salt and pepper.
- Make the horseradish cream: In a small bowl, whisk together sour cream, horseradish, Dijon mustard, and lemon juice. Season with salt and pepper to taste. Set aside.
- Caramelize the onions: Heat 1 tablespoon of oil in a large skillet over medium heat. Add the sliced onion and sugar, and cook, stirring occasionally, for 8-10 minutes, until soft and golden brown. Transfer to a plate and set aside.
- Sear the beef: Wipe out the skillet and heat the remaining 1 tablespoon of oil over high heat until shimmering. Working in batches if needed, add the Wagyu slices in a single layer. Sear for 30-60 seconds per side, until nicely browned but still pink in the center. Remove immediately to a plate. The beef is safe to eat at 145°F (63°C) for whole cuts, but for best texture, aim for medium-rare; use a food thermometer to check.
- Toast the bread: Spread the cut sides of the rolls with butter. In the same skillet over medium heat, toast the rolls cut-side down until golden and crisp, about 1-2 minutes.
- Assemble the sandwiches: Preheat your broiler. Place the bottom halves of the rolls on a baking sheet. Divide the seared beef between them, then top with caramelized onions and a slice or two of cheese. Place under the broiler for 1-2 minutes, until the cheese is melted and bubbly.
- Finish and serve: Spread the top halves of the rolls with a generous amount of horseradish cream. Close the sandwiches, slice in half if desired, and serve immediately.
Tips
- Slice the beef thinly: If your Wagyu is a whole steak, freezing it briefly makes it much easier to slice thinly. This ensures it cooks quickly and evenly.
- Don’t overcook: Wagyu has a high fat content, but it becomes tough and greasy if overcooked. Sear it quickly over high heat and remove it from the pan while still pink.
- Use a thermometer: For food safety, whole cuts of beef should reach a safe minimum internal temperature of 145°F (63°C) as per USDA FSIS, followed by a 3-minute rest. However, many prefer Wagyu at medium-rare (130-135°F / 54-57°C) for texture; if you choose this, be aware of the trade-off.
- Substitution: If you can’t find Wagyu, use high-quality ribeye or sirloin, sliced thin. The sandwich will still be delicious, though less marbled.
Serving Suggestions
Serve this sandwich hot, with extra horseradish cream on the side for dipping. It pairs wonderfully with a crisp green salad, sweet potato fries, or a light coleslaw to balance the richness. For a full meal, add a side of pickles or roasted vegetables.
Variations
- Spicy version: Add sliced jalapeños or a drizzle of sriracha mayo instead of horseradish cream.
- Cheese swap: Use blue cheese, brie, or cheddar instead of provolone or Swiss for a different flavor profile.
- Add greens: Add a handful of arugula or spinach before closing the sandwich for a peppery bite.
- Mushroom version: Sauté sliced mushrooms with the onions for an earthy, umami boost.
Storage and Reheating
This sandwich is best served fresh, but leftovers can be stored in an airtight container in the refrigerator for up to 2 days. To reheat, wrap in foil and warm in a 350°F (175°C) oven for 10-15 minutes, or until heated through. Avoid microwaving, as it will make the bread soggy and the beef rubbery.
Frequently Asked Questions
Can I use frozen Wagyu? Yes, but thaw it in the refrigerator overnight before slicing. Do not refreeze once thawed.
What is the best cut of Wagyu for this sandwich? Ribeye or striploin are ideal because they have good marbling and tenderness. Flank or sirloin can also work if sliced thinly.
Can I cook the beef ahead of time? Yes, you can sear the beef and caramelize the onions a day ahead. Store them separately in the refrigerator, then assemble and broil the sandwich when ready to serve.
How do I know when the beef is done? Use a food thermometer. For medium-rare, look for 130-135°F (54-57°C). For medium, 140-145°F (60-63°C). Remember, the USDA recommends 145°F (63°C) for whole cuts, followed by a 3-minute rest.
Can I make this without a broiler? Absolutely. After assembling the sandwich, you can close it and toast it in a skillet over medium heat, pressing down with a spatula, until the cheese melts.
What if I don’t like horseradish? Substitute with Dijon mustard, mayo, or a garlic aioli for a different but equally delicious sauce.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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