What is the primary fruit juice ingredient in a Tequila Sunrise?

The primary fruit juice ingredient in a Tequila Sunrise is orange juice. This classic cocktail combines tequila with orange juice, resulting in a refreshing and vibrant drink. The characteristic gradient effect, resembling a sunrise, is achieved by adding grenadine syrup, which sinks to the bottom of the glass. While pineapple juice, grapefruit juice, and lime juice can be found in other cocktails, they are not part of the traditional Tequila Sunrise recipe. The use of orange juice not only contributes to the drink's signature flavor but also complements the tequila, enhancing the overall taste experience.