Wash and dry all produce. Adjust rack to middle position and preheat oven to 400 degrees. Cut one baguette into 1/2-inch cubes. Halve and core pear; cut into 1/2-inch wedges. Place baguette cubes and pear on opposite sides of a foil-lined baking sheet. Toss each with salt, pepper, and a drizzle of oil. Bake until baguette is crisp, 8-10 minutes.

Meanwhile, halve, peel, and thinly slice shallots. Pick and finely chop enough rosemary leaves from stems to give you 2 tsp. Split remaining baguette in half lengthwise. Place garlic herb butter in a small bowl and microwave on high until melted, about 30 seconds. Drizzle over baguette halves.

Once pear and baguette cubes have baked 8-10 minutes, remove cubes from sheet and set aside. Flip pear and continue baking until browned, another 10-15 minutes. Meanwhile, heat a drizzle of oil in a large pan over medium-high heat. Season steak all over with salt and pepper. Add to pan and cook to desired doneness, 3-6 minutes per side.

Remove steak from pan and set aside to rest. Lower heat to medium and heat a drizzle of oil in same pan. Add shallots and cook, tossing, until lightly browned, 5-7 minutes. Add chopped rosemary and cook until fragrant, about 30 seconds. Stir in demi-glace, 1/2 cup water, and 1 tsp vinegar (we’ll use more later), scraping up any browned bits on bottom. Simmer until thickened, 1-2 minutes. Season with pepper.

While shallots cook, place buttered baguette halves cut-side up on another baking sheet. Toast in oven until golden brown, 6-7 minutes. Meanwhile, toss arugula, baguette cubes, 2 tsp vinegar, and 1 TBSP olive oil in a medium bowl (you’ll have vinegar left over). Season with salt and pepper.

Slice steak against the grain. Divide steak, salad, and garlic bread between plates. Drizzle sauce over steak. Top salad with pear and crumble ricotta salata over.