For a substantialsalad, pearl barley is matched with dilland poached salmon, an excellent sourceof protein.
Put pearl barley and 1 1/4 cups water into a medium saucepan. Bring to a boil over medium-high heat; cover, and reduce heat to medium-low. Simmer until water has been absorbed and barley is tender, about 30 minutes. Drain any excess water, and return barley to saucepan. Fluff with a fork; cover, and set aside.
Bring wine, 5 cups water, the peppercorns, 1/2 teaspoon salt, the bay leaf, and 1 tablespoon lemon juice to a boil in a large high-sided skillet over medium-high heat. Reduce heat to medium-low. Simmer 5 minutes. Add salmon; cook 4 minutes. Using a slotted spoon, transfer salmon to a nonreactive dish. Cover; let stand 5 minutes.
Meanwhile, whisk together remaining tablespoon lemon juice, the oil, dill, and remaining 1/2 teaspoon salt in a small bowl; season with pepper.
Toss together barley, salmon, onion, and cucumber in a large bowl. Gently fold in vinaigrette. Divide salad among six plates; garnish with dill, and serve with lemon wedges.