Sprinkle steak evenly with 3/8 teaspoon salt and pepper. Place steak on grill rack coated with cooking spray; grill 4 minutes on each side or until desired degree of doneness. Let steak stand 5 minutes. Cut steak diagonally across grain into thin slices.
Combine remaining 1/8 teaspoon salt, cilantro, and next 3 ingredients (through jalapeño) in a medium bowl; toss. Top with peanuts. Serve salad with steak.
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