1. Preheat an outdoor grill for high heat and lightly oil the grate. 2. Sprinkle steak with salt and pepper. 3. Combine olive oil, vinegar, shallot, and mustard in a blender or small food processor. Sprinkle salt and pepper to taste; puree dressing until smooth. 4. Grill steak until medium-rare, or when internal temperature reaches 130 degrees F (55 degrees C); 6 to 7 minutes per side. Transfer to a cutting board; let rest for 5 minutes. 5. Place watercress in a large bowl. Pour in dressing to coat; toss to combine. Sprinkle additional salt and pepper. 6. Slice steak thinly across the grain; transfer to a serving platter. Top with watercress, grapes, and Stilton cheese. Serve with any additional dressing. ---------------------------------------------------------------------------
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