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 have three kinds of hot sauce in my purse. I have a soft spot for making people their favorite dessert, especially if it's wrapped in a pastry crust. My newest cookbook, The Book on Pie, came out on November 10th, 2020, and my pie merch collaboration with Food52 is out now too: https://food52.com/shop/merchants/manifest-food52/food52-x-erin-mcdowell