Muddle the mint with the simple syrup in a cocktail shaker with a strainer, then add the remainder of the ingredients, ice and shake 15-20 seconds.
Pour in your favorite shallow glass, add a cube or two of ice (the bigger, the slower it melts) and top with a thin slice of a Blood Orange.
If you prefer to go a little more traditional mojito-esque, add a splash of club soda.
Gently lay the orange slice on top.