How to Make It
Preheat a grill or grill pan over medium-high heat.
Coat the steak with 1 teaspoon oil. Sprinkle with 1/8 teaspoon salt. Add steak to grill rack or pan coated with cooking spray; grill steak 3 minutes on each side or until desired degree of doneness. Remove from heat; let stand 8 minutes. Cut steak diagonally across the grain into thin slices; sprinkle with 1/8 teaspoon salt.
While steak rests, combine vinegar, honey, remaining 1/4 teaspoon salt, and remaining 2 1/2 tablespoons oil in a large bowl, stirring with a whisk. Add lettuce and radicchio; toss to coat. Add nectarines; sprinkle with cheese. Serve steak over salad.