The juan ho royale is a modern classic from master mixologist martin cate. It looks absolutely gorgeous, with its bubbly, glittering sea-blue color, but its also a genuinely delicious tequila cocktail in its own right. Its quite possibly the ideal blue cocktail. If you dont have blue curaao on hand, you can use orange curaao (or triple sec, or orange shrubb), with a drop or two of blue food dye added.