If your farmers' market doesn't have slender haricots verts, grab a handful of regular green beans and cook them a couple of minutes longer. Halloumi is a wonderfully salty-nutty cheese that's firm enough to stand up to grilling; if you can't find it, use ricotta salata or queso fresco.
8 ounces haricots verts (French green beans)
1 small seedless watermelon (about 5 pounds)
4 ounces halloumi cheese, cut into 4 triangles
1 tablespoon extra-virgin olive oil
2 teaspoons fresh lemon juice
1/2 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
1/3 cup torn fresh mint leaves
4 cups baby arugula
1/4 cup roasted, unsalted pistachios, coarsely chopped
How to Make It
Bring a large saucepan of water to a boil. Add haricots verts; cook 3 minutes or until crisp-tender. Drain and rinse with cold water; drain.
Heat a large grill pan over high heat. Cut watermelon lengthwise into 4 quarters. Cut 1 quarter crosswise into 8 (3/4-inch-thick) wedges; reserve remaining watermelon for another use. Add watermelon and cheese to grill pan coated with cooking spray; grill 2 minutes on each side or until grill marks appear.
Combine oil, juice, salt, and pepper in a medium bowl, stirring with a whisk. Remove 2 teaspoons oil mixture; set aside. Add haricots verts and mint to bowl; toss to coat. Arrange bean mixture on a platter. Return reserved 2 teaspoons oil mixture to bowl. Add arugula to bowl; toss to coat. Arrange arugula mixture, watermelon, and cheese on platter. Sprinkle with nuts.