- 1 (2 pound) flank steak
- kosher salt and ground black pepper to taste
- 1/4 cup extra-virgin olive oil
- 1 1/2 tablespoons red wine vinegar
- 1 tablespoon chopped shallot
- 1/4 teaspoon Dijon mustard
- 2 bunches watercress, stemmed
- 2 cups seedless red grapes, halved
- 1/2 cup crumbled Stilton cheese
- Preheat an outdoor grill for high heat and lightly oil the grate.
- Sprinkle steak with salt and pepper.
- Combine olive oil, vinegar, shallot, and mustard in a blender or small food processor. Sprinkle salt and pepper to taste; puree dressing until smooth.
- 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.
- Place watercress in a large bowl. Pour in dressing to coat; toss to combine. Sprinkle additional salt and pepper.
- Slice steak thinly across the grain; transfer to a serving platter. Top with watercress, grapes, and Stilton cheese. Serve with any additional dressing.