Ingredients
Method
Caramelize the Onions
- Heat 1 tbsp olive oil in a wide skillet over medium heat. Add the thinly sliced onions with a pinch of salt.
- Cook on medium-low, stirring every 3–5 minutes. The onions should soften and slowly turn golden after about 30 minutes.
- If you have time, let them reach the perfect caramelization point at the 45-minute mark. Add 1 tsp balsamic vinegar in the last few minutes of cooking.
Prepare the Steak
- Pat steak dry, season with salt and pepper, and sear in a hot skillet for 3–4 minutes per side until browned and cooked to your liking.
- Rest the steak for 5 minutes, then slice thinly against the grain.
Prepare the Bread and Arugula
- Top bread slices with provolone cheese and toast until golden.
- Massage the arugula with a drizzle of olive oil, a pinch of salt, and some black pepper to soften it and enhance the flavor.
Make the Horseradish Mayo
- Mix together mayo, horseradish, Dijon mustard, lemon juice, and salt.
- Spread generously on the toasted bread.
Assemble the Sandwich
- Layer sliced steak, caramelized onions, and arugula on the toasted bread.
- Serve and enjoy!
Notes
- For perfectly caramelized onions, patience is key. Stir them frequently and cook on low heat to avoid burning.
- Let the steak rest after cooking to retain its juices and ensure tender slices.
- Massage the arugula to enhance its flavor and texture for the sandwich.
- Use thick artisan bread for a sturdy base that holds all the ingredients well.
- Toast the bread with cheese for a melty and flavorful touch.
