How to Make It
Combine first 8 ingredients in a small bowl; cover and chill vinaigrette. Wash beans, and trim ends; remove strings. Place beans in a large saucepan of boiling water; cook 2 minutes; drain. Rinse under cold water; drain well. Set aside.
Coat halibut with cooking spray; rub peppercorns and salt over both sides of steaks. Prepare grill. Place halibut on grill rack coated with cooking spray; grill 3 minutes on each side or until fish flakes easily when tested with a fork. Remove from heat; cool slightly. Break halibut into pieces; discard skin and bones.
Place lettuce in a large bowl, and add lemon juice, tossing to coat. Divide lettuce mixture evenly among 4 plates. Arrange green beans, halibut, and tomato wedges evenly on plates, and sprinkle each serving with chopped olives. Drizzle vinaigrette over salads.