Chilled Cucumber and Dill Soup

Name: Chilled Cucumber and Dill Soup
Ingredients: 20 oz cucumber & dill veggie dip (or substitute greek yogurt, dill and a cucumber); 1 teaspoon lemon juice; 1 cup whole milk; ¼ cup chopped sweet onion; 4 green onions, white and green parts, chopped; 2 teaspoons kosher salt; 1 teaspoon freshly ground black pepper; 4 Tablespoons freshly squeezed lemon juice (1 large lemon); Cooked langostino, shrimp or salmon (optional); Garlic powder (optional); Preserved lemon, minced for garnish; Lemon wedges, for garnish; Fresh dill, for garnish