Bring 4 cups water to a simmer in a saucepan. Remove from the heat, add the tea bags and let steep for 8 minutes. Remove the tea bags and stir in the honey. Let cool.
Add the sweetened tea to a pitcher along with 2 cups ice and another 4 cups water; stir. Add the sliced kumquats (if using), key limes and lemon. Pour into glasses over ice and garnish with mint.