Preheat the oven to 450 degrees F. Toss the celery, 1 teaspoon olive oil, and salt and pepper to taste on a foil-lined rimmed baking sheet; roast until tender, about 20 minutes.
Whisk the mayonnaise, 2 teaspoons olive oil, the lime juice, honey, hot sauce and 1 tablespoon water in a large bowl. Add the roasted celery and toss. Add the lettuce and watercress but don't toss.
Heat a large grill pan or cast-iron skillet over high heat. Rub the steak with the remaining 1 teaspoon olive oil and season with salt and pepper. When the pan is very hot, add the steak and cook, undisturbed, about 3 to 4 minutes per side for medium rare. Transfer to a cutting board. Add the scallions to the pan and cook until charred, about 2 minutes per side.
Slice the steak against the grain, discarding the tough membrane that runs through the center. Add the steak and tomatoes to the bowl with the salad and toss to coat. Divide among plates.
Tools You May Need
Photograph by Antonis Achilleos
Courtesy of Food Network Magazine
Tools You May Need
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