Blue curacao is a blue-colored liqueur made from the dried peel of bitter oranges, and it adds a unique tropical flavor and bright blue color to the cocktail. The gin provides a botanical and herbal flavor that balances out the sweetness of the blue curacao, while the lemon juice and sugar provide a tart and sweet flavor that complements the other ingredients. 
 
Overall, Blue Altona Lagoon is a great cocktail for anyone who loves a unique and colorful drink with a tropical twist. It's perfect for summertime parties or any occasion that calls for a fun and refreshing beverage.