In the bottom of a bowl, muddle the ginger, lime zest, and lime juice to combine. Stir in the grapefruit juice, syrup, and tequila, and pour the mixture over ice. A lime-salt rim would be an excellent addition.
I always carry three kinds of hot sauce in my purse. I have a soft spot for making people their favorite dessert, especially if it's pie. My first cookbook, The Fearless Baker, is out on October 24, 2017.