Griddled Ciabatta Steak Sandwich with Caramelized Onions

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A hearty steak sandwich featuring butter-toasted ciabatta rolls, tender seared steak, and sweet caramelized onions for a perfect balance of savory and sweet flavors. This american-inspired sandwiches & wraps ready in about 40 minutes pairs split in half ciabatta rolls, softened unsalted butter, sirloin steak for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 650 calories and feeds 2, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 30 min Serves 2 American cuisine 650 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat a griddle or large skillet to medium heat. Spread 2 tbsp softened unsalted butter evenly on the cut sides of 2 ciabatta rolls and place them buttered-side down on the griddle. Toast for about 3 minutes or until golden brown and warm, then remove and keep warm.
  2. Step 2: In the same griddle, add 1 tbsp olive oil and add 1 medium thinly sliced yellow onion. Cook over medium heat, stirring occasionally, for 15-18 minutes until onions are deeply golden and caramelized. Remove and set aside.
  3. Step 3: Pat 10 oz sirloin steak dry and season both sides with 1 tsp salt, 1/2 tsp black pepper, and 1/4 tsp garlic powder. Increase heat to medium-high and sear steak for 3-4 minutes per side for medium-rare or longer to desired doneness. Remove and let rest for 5 minutes before slicing thinly against the grain.
  4. Step 4: Spread 2 tbsp mayonnaise evenly on the bottom halves of the toasted ciabatta rolls. Layer with 1 cup fresh arugula, the sliced steak, and the caramelized onions. Top with the other halves of the rolls and serve immediately.

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Frequently asked questions

How long does Griddled Ciabatta Steak Sandwich with Caramelized Onions take to make?

Total time is about 40 minutes (10 min prep + 30 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Griddled Ciabatta Steak Sandwich with Caramelized Onions?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep split in half ciabatta rolls from drying out.

Can I substitute ingredients in Griddled Ciabatta Steak Sandwich with Caramelized Onions?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Griddled Ciabatta Steak Sandwich with Caramelized Onions for a different number of people?

The recipe is written for 2 servings. Multiply each ingredient by (your serving target / 2). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Griddled Ciabatta Steak Sandwich with Caramelized Onions?

American sandwiches & wraps like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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