Cucumber and Israeli Couscous Salad

Name: Cucumber and Israeli Couscous Salad
Ingredients: 1/4 cup extra virgin olive oil; 1 cup Israeli couscous; 6 to 8 tablespoons fresh lemon juice, to taste; 3 cups chopped fresh flat-leaf parsley (from 3 large bunches); 1/4 cup chopped fresh mint; 1/2 pound ripe tomatoes, very finely chopped; 3/4 pound cucumbers (1 European or 4 Persian), seeded if using regular cucumbers, cut in fine dice; 1 bunch scallions, finely chopped, or 1/4 cup chopped chives; Salt to taste; 1 romaine lettuce heart, leaves separated, washed and dried