One 10-ounce can frozen kalamansi or orange juice concentrate, thawed
1 3/4 cups white rum
1 quart club soda
1 large lime, cut into 10 thin wedges
In a large pitcher, combine the halved kumquats and mint leaves. Using a large wooden spoon, vigorously muddle the mixture. Pour in the juice concentrate, rum and club soda and squeeze in the lime wedges. Fill the pitcher with ice and serve.