Use a vegetable peeler to peel the orange, avoiding as much white pith as possible. In a small saucepan, combine the orange peel with the tea bags, peppercorns, cloves and 2 cups water. Bring to a boil over high heat.
Add the sugar and cook, stirring, until dissolved, about 1 minute. Cover, remove from the heat and let cool completely, about 2 hours. Strain the tea and discard the solids. The cooled, brewed tea can be refrigerated in an airtight container for up to 2 weeks.
To serve, in a large pitcher, stir together the tea, tonic water, grapefruit juice and about 1 cup ice. Divide among rocks glasses filled with ice and garnish with orange wedges.
