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. 1Remove the steak from the refrigerator and place it on a plate. With paper towels, pat both sides dry and season liberally with salt and pepper on both sides. Let it come to room temperature while you caramelize the onions.
2. 2For the Dijon onions, heat 1 tablespoon of oil in a large saute pan over medium-high heat. Add the sliced onions and 1/4 teaspoon of kosher salt. Cook until the onions begin to soften and brown, 5-8 minutes. Reduce the heat to low and let cook, stirring occasionally, until the onions are very soft and caramelized, about 15 additional minutes.
3. 3Remove from heat and stir in the Dijon mustard to evenly coat the onions. Remove the onions to a plate or bowl, then with a paper towel, carefully wipe the skillet clean.
4. 4Preheat the oven to 350°F. Heat the remaining 1 1/2 tablespoons olive oil in the skillet over medium-high heat. Once the oil is very hot and almost smoking, add the seasoned steak. Sear the for 1 minute on each side, then reduce the heat to low and cook the steak for about 7 to 10 minutes, turning once, until very rare in the center and an instant-read thermometer inserted in the center reaches 125°F.
5. 5Transfer to a plate and cover with foil. Let rest for 10 minutes, then slice against the grain into strips.
6. 6To assemble the sandwiches, spread some of the melted butter onto the bottom of a 9x13-inch baking dish, using just enough to coat the pan. Lay the bottom of the buns in a single layer in the baking dish (if using a baguette, split it lengthwise into a top and bottom half, then cut it in half crosswise so you have two shorter sandwiches that fit in your baking dish).
7. 7Top the bread with the arugula.
8. 8Layer on the steak.
9. 9Add some slices of creamy brie.
10. 10Finish with the Dijon red onions.
11. 11Spread the inside of the top buns with jam, then lay the buns on top to complete the sandwiches. Brush the bun tops with the remaining melted butter, then cover the pan with foil.
12. 12Bake for 15 minutes, just until the cheese has melted. Transfer to a serving plate and enjoy warm.