Smoked Onion Steak Sandwich
Smoked Onion Steak Sandwich
Most steak sandwiches are just a good steak on bread. This one was built from the bottom up.
Bread has to be sturdy enough to carry smoked onions without going soft underneath. More sandwiches in the steak collection.
Butter-basted ribeye over caramelized red onions, golden cremini mushrooms, and a brandy cream sauce, all of it seasoned with Kinder’s Smoked Onion Seasoning. That one product runs through every component: the steak crust, the mushroom saute, the pan sauce. Every layer speaks the same flavor language.
The ribeye is the obvious centerpiece. The pan sauce is what makes this a composed dish. After the steak sears and rests, the skillet holds a layer of fond, concentrated caramelized bits from three rounds of cooking. Brandy lifts the fond, heavy cream follows, and a teaspoon of Kinder’s Smoked Onion ties the sauce back to the steak. It reduces to a spoonable consistency that’s too good to leave in the pan.
The caramelized red onions take 15–20 minutes on low heat. That’s the only patient part of this recipe, and it’s non-negotiable. Raw red onion goes from sharp and astringent to deeply sweet and silky. Not a garnish; a structural layer.
Total time is 35 minutes. One pan, sequential steps: caramelize onions, cook mushrooms, sear steak, build sauce, assemble. Every step builds on the last so the flavors compound as you go.
Serve it the moment it’s assembled, ribeye warm, sauce still saucy, ciabatta just toasted. This is the version you keep making.
Flavor First.
Smoked Onion Steak Sandwich
Ingredients
Equipment
Method
- Caramelize onions: In a large skillet over medium-low heat, add 1 Tbsp olive oil and sliced red onions. Cook slowly, stirring occasionally, for 15-20 minutes until deeply golden, soft, and sweet. Season lightly with a pinch of Kinder’s Smoked Onion Seasoning. Remove and set aside.
- Cook mushrooms: In the same skillet over medium heat, add 1 Tbsp butter. Add sliced mushrooms and 1-2 tsp Kinder’s Smoked Onion Seasoning. Saute 6-8 minutes until golden, tender, and all liquid has evaporated. Remove and set aside.
- Prep steaks: Pat ribeyes completely dry. Season both sides generously with Kinder’s Smoked Onion Seasoning. Rest at room temperature 10-15 minutes.
- Sear steaks: Heat 2 Tbsp olive oil in the same skillet (cast iron preferred) over medium-high heat until shimmering. Add steaks and sear 3-4 minutes per side for medium-rare (internal 130-135 degrees F). Flip only once.
- Butter baste: Flip steaks, add 3 Tbsp butter and rosemary sprigs to the pan. Cook 1-2 more minutes, continuously spooning the melted butter over the top of the steaks. Remove steaks to a cutting board, discard rosemary, and rest 8-10 minutes.
- Make the creamy sauce: In the same skillet (with all the residual fond) over medium heat, add diced shallot and minced garlic. Saute 1-2 minutes until fragrant. Sprinkle in 1 tsp Kinder’s Smoked Onion Seasoning.
- Deglaze: Pour in brandy (carefully — it may briefly flame). Scrape up all browned bits from the bottom of the pan. Let reduce for 1 minute. Add heavy cream, bring to a gentle simmer, and cook 3-5 minutes until thickened to a spoonable consistency. Taste and adjust seasoning.
- Assemble: Lightly toast ciabatta rolls. Spread a generous layer of creamy sauce on the bottom half of each roll. Layer on mushrooms, then thinly sliced rested ribeye, then caramelized red onions. Drizzle more sauce over the top. Add arugula or spinach if desired. Cap with the top bun and cut in half.
Nutrition
Notes
- Patience on the onions — Low and slow is not optional. Medium-low heat, 15–20 minutes, occasional stir. If the onions are browning fast on the outside but still firm, the heat is too high. Lower it and keep going — the payoff is a deeply sweet, golden topping that no high-heat shortcut replicates.
- Dry the mushrooms first — Cremini mushrooms carry moisture. If the pan is crowded or not hot enough, they’ll steam and turn rubbery instead of sautéing golden. Pat them dry, use a hot pan, give them room, and don’t stir until they’ve started to color.
- Rest the steak fully — At 1 to 1½ inches thick, ribeye needs 8–10 minutes off heat. Cut it early and the juice runs onto the board and into the roll. Rest it properly and the slices hold together in the sandwich.
- Deglaze carefully — When you add the brandy, keep the heat at medium and pour slowly. Scrape every caramelized bit from the bottom of the pan before the cream goes in — that fond is where the sauce gets its depth.
- Non-alcoholic swap — Replace the brandy with ¼ cup beef stock plus 1 tsp Worcestershire sauce. Same deglazing result, same richness, no alcohol.
- Add cheese — Provolone or Gruyère melted over the steak slices while still warm in the pan pairs well with the smoked onion sauce. Optional, but worth it.
- Serve immediately. The steak is best warm, the sauce is best loose and pourable, and the ciabatta softens the longer it sits under everything. This is not a sandwich you plate and walk away from.
- Thin-cut fries are the natural companion. A simple arugula salad also works — the peppery bite echoes the arugula you can layer inside the sandwich itself, and keeps the meal from feeling heavy.
- Pour any extra sauce into a small ramekin for dipping as you eat. There will be extra sauce. Don’t leave it in the pan.
- Store the steak, mushrooms, onions, and sauce separately in the refrigerator for up to 2 days. Do not store assembled sandwiches — the rolls go soggy and the components separate.
- To reheat: warm steak slices in a skillet with a drizzle of butter over medium heat. Reheat mushrooms and onions together in a pan. Warm the sauce gently with a splash of cream to bring it back to a spoonable consistency. Assemble fresh each time.
- Don’t freeze the assembled sandwich or the cream sauce. Cream-based sauces separate when frozen and don’t come back together cleanly.
Tried this recipe?
Let us know how it was!Frequently Asked Questions
Why does the recipe use brandy in the sauce?
Brandy lifts the fond from the bottom of the pan, that concentrated layer from searing the steak, mushrooms, and onions is where most of the flavor lives. The alcohol burns off quickly, leaving a fruity, rich note that deepens the cream sauce. Swap it for ¼ cup beef stock plus 1 tsp Worcestershire sauce for the same result without alcohol.
Can I use a different cut of steak?
NY strip is the closest swap, similar thickness and cook time, slightly leaner. Skirt steak works for a more economical option; cook to medium and slice very thin against the grain. Avoid filet, it’s too lean and mild to hold up under this much seasoning and sauce.
The sauce got too thick. How do I fix it?
Add a splash of cream or beef stock, 1 tablespoon at a time, and stir over low heat until it loosens to spoonable. Cream sauces thicken fast off heat, a quick warm with a splash of liquid brings them right back.
Can I prep any of this ahead?
The caramelized onions and mushrooms both reheat well, make them up to a day ahead and refrigerate separately. The sauce is best built fresh from the fond after searing. Sear the steak to order; sliced ribeye doesn’t hold.
What roll works if I can’t find ciabatta?
A sturdy hoagie roll or split French baguette both hold up to the sauce. Avoid soft sandwich bread or brioche, they go soggy under the cream sauce before you finish the first half.
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