Steak Sandwich

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  Beef, New York Strip Steak
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  Kosher salt
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  Ground black pepper
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  Olive oil(38g)

  Regular (not extra-virgin) olive oil for high-heat cooking. EVOO for dressings.

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  Yellow Onion
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  Mustard, Dijon(15g)

  Dijon mustard — Grey Poupon or store brand. Spicier than yellow mustard.

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  Unsalted Butter(30g)
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  Bread, Ciabatta
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  Arugula(240g)
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  Cheese, Brie, Soft-Ripened(170g)
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  Fig jam(120g)

Instructions

1. 1Pat the steak dry with paper towels and season both sides generously with salt and pepper. Let sit at room temperature for 20 minutes while you prepare the onions.
2. 2Heat the olive oil in a large skillet over medium-high heat. Add the sliced onion and a pinch of salt. Cook 5–8 minutes, stirring occasionally, until the onion begins to soften and brown at the edges. Reduce heat to low and continue cooking 12–15 minutes, stirring often, until deeply caramelized and very soft. Stir in the Dijon mustard until evenly combined, then transfer to a plate.
3. 3Wipe the skillet clean with a paper towel. Add the remaining olive oil and heat over medium-high heat until shimmering and just beginning to smoke, about 2 minutes. Place the steak in the pan and sear 1 minute per side until a golden crust forms.
4. 4Reduce heat to low and cook the steak 7–10 minutes more, turning once, until an instant-read thermometer inserted into the center reaches 125°F for medium-rare. Transfer to a plate, tent loosely with foil, and rest 10 minutes. Slice against the grain into strips.
5. 5Preheat the oven to 350°F. Butter the bottom halves of the ciabatta bread and place in a baking dish. Layer each with arugula, steak strips, brie slices, and caramelized onions.
6. 6Spread the inside of the bread tops with fig jam, place on the sandwiches, and brush the exterior with remaining butter. Cover the dish with foil.
7. 7Bake 12–15 minutes at 350°F until the brie melts and the bread is warm throughout. The cheese should be visibly softened and beginning to ooze slightly between the bread layers.
8. 8Remove from the oven and serve immediately while warm.