1 tablespoon olive oil
1/2 cup sliced onion
1 teaspoon chopped garlic or green garlic
2 teaspoons chopped parsley leaves, plus more for garnishing
2 teaspoons chopped chives, plus more for garnishing
1 teaspoon chopped tarragon leaves, plus more for garnishing
1 head lettuce, leaves torn
1 1/2 cups chicken stock
1/4 cup heavy cream or evaporated milk
1/4 teaspoon salt
1/8 teaspoon pepper
Makes 2 servings