You can swap out your favorite garden tomatoes for the heirlooms in this tomato-centric salad, but don’t replace the green tomato. Some tomato selections (like Green Zebra) ripen to a lovely shade of green, but this dressing calls for a not-yet-ripened red tomato. Its tart flavor is key to the vinaigrette, which tastes great with any grilled meat or vegetable.
1 1/2 pounds flank steak
1 1/2 teaspoons kosher salt, divided
1 1/2 teaspoons black pepper, divided
5 tablespoons olive oil, divided
1 medium-size green tomato, halved and cored (about 4 oz.)
2 tablespoons rice vinegar
1 1/2 teaspoon honey
1 teaspoon Dijon mustard
5 ounces mixed greens (about 3 cups packed)
3 ounces arugula (about 2 cups packed)
2 large heirloom tomatoes, cut into 1-inch-thick wedges (8 oz.)
3/4 cup thinly sliced red onion (from 1⁄2 red onion)
How to Make It
Preheat grill to high (450°F to 500°F). Sprinkle flank steak with 1 teaspoon each of the salt and pepper. Let stand at room temperature 30 minutes.
Meanwhile, spread 1 tablespoon of the oil over cut sides of green tomato halves, and sprinkle with remaining 1⁄2 teaspoon each of salt and pepper. Grill tomato halves, covered and turning halfway through, until charred on both sides and slightly tender, 12 to 14 minutes. Remove from grill; place in a large bowl. Cover with plastic wrap, and let stand until cool enough to handle, about 5 minutes.
Peel and discard skin from charred tomato halves; place tomato halves, vinegar, and honey in a blender or food processor. Process until tomato is finely chopped but not smooth. Pour into a medium bowl, and whisk in mustard. Add remaining 4 tablespoons oil in a slow, steady stream, whisking constantly until smooth. Set vinaigrette aside.
Grill steak, covered and turning once, until charred on both sides and a meat thermometer inserted into thickest portion of steak registers 120°F or to desired degree of doneness, about 4 minutes per side. Let steak rest 10 minutes. Cut diagonally across the grain into thin strips.
Arrange mixed greens, arugula, heirloom tomato wedges, cherry tomato slices, and red onion on a large serving platter. Top with sliced steak, and drizzle with desired amount of vinaigrette.