Preheat oven to 375°F.
Cut the potatoes in half and place them in a medium pot. Fill with enough cold water to cover the potatoes, bring to a boil and cook until just fork tender, about 10 to 12 minutes.
Cut the baguette into small cubes and place on a small baking sheet. Drizzle with 2 tablespoons olive oil and season with a bit of salt, pepper, and Italian seasoning. Toss together to evenly coat and then bake until golden brown and crispy, about 8 to 10 minutes. Remove from the oven and let cool.
Preheat an outdoor grill or stovetop grill pan over medium-high heat. Drizzle the steak with 2 tablespoons olive oil and season liberally, on both sides, with plenty of salt and pepper. Place the steak on the grill and cook over direct heat for 5-7 minutes per side until they reach an internal temperature of 130° for medium rare. Transfer to a plate and allow to rest for 10 minutes before slicing into thin strips against the grain of the meat.
Drain the potatoes and transfer to a bowl. Toss with the remaining 2 tablespoons olive oil and season with a bit of salt and pepper. Place the potatoes, cut side down, onto the hot grill and cook for about 2 to 3 minutes, just until charred. Return to bowl and allow to cool slightly.
To make the dressing, combine the egg yolk, garlic, lemon juice, 1 or 2 anchovy fillets (depending on how you like them), a pinch of salt and pepper, Parmesan, and Worcestershire sauce in a small food processor. Blend until just beginning to come together. Then while the machine is running, drizzle in as much of the oil as needed to create a smooth thickened dressing. Give it a taste and adjust seasoning if necessary, adding more salt or pepper if needed.
To assemble the salad, cut the romaine hearts into shreds and add to a large salad bowl. Drizzle in a few spoonfuls of dressing and toss to coat. Transfer the lettuce to a large serving platter or 6 individual plates. Top each with sliced steak, grilled potatoes, croutons, scallions and Parmesan. Drizzle a bit more of the dressing on top before serving. Enjoy!