Step 1To make the dressing, combine the lemon juice, mustard, pinch sea salt, vinegar, shallot and olive oil in a medium bowl and set aside.
Step 2To prepare the salad, bring the water to a boil in a large saucepan. Add the barley with the remaining salt and bay leaves. Simmer until the barley is tender and all of the water is absorbed, 45 minutes to 1 hour total cooking time. Remove from heat and cool.
Step 3Place the barley in a large bowl, and stir in the dressing and oregano. Cover and chill for about 2 hours or until ready to serve. Before serving, gently stir in the olives, capers, pine nuts and green onions.