Which ingredient is NOT used in a Blue Moon cocktail?

The Blue Moon cocktail traditionally includes gin, blue curaçao, and cream, which contribute to its unique flavor profile and striking blue color. Tequila is not a part of this specific recipe and does not align with the classic combination of ingredients used in a Blue Moon cocktail.

Understanding this, it's important to recognize that each ingredient in the cocktail has a purpose. Gin serves as the base spirit, while blue curaçao adds both flavor and the distinctive hue. Cream provides a smooth texture and balances the sweetness of the blue curaçao. Tequila, on the other hand, would significantly alter the cocktail's intended taste and aesthetic, which is why it is not included in the traditional recipe.