Bring 3 cups water and the ginger to a boil in a medium pot. Add the tea bags, take the pot off the heat, and steep for 4 minutes. Remove the tea bags and stir in the sugar until dissolved. Cool; discard ginger.
Put the tea, peach nectar, tequila and lime juice in a pitcher and stir to combine. Stir in the peach slices. Serve over ice.