Muddle (Press peels into sugar with a muddler until coated with sugar and oils are released. About a minute) 1/2 lemon peel 1/4 grapefruit peel and sugar in the bottom of a serving pitcher.
Let stand for at least 30 minutes.
Add the remaining ingredients, fill with ice and stir briefly.
Garnish with grapefruit wheels and serve in any glass you like, with or without ice.