Bring 2 cups of water to a boil. Add the hibiscus and turn off the heat. Cover and steep for at least 4 hours until fully cooled, or overnight for best flavor.
Remove the peel from an orange, being sure to also remove the pith. Bring 1 cup of water to a simmer and add 1 ¼ cup of sugar. Once the sugar fully dissolves, add the orange peels. Simmer on low until the orange peels are translucent.
Strain the brewed hibiscus tea, lemon juice, and orange simple syrup into a 32-ounce pitcher. Adjust to taste. This is the hibiscus lemonade concentrate.
To serve, dilute with ice or cold water just before serving with citrus slices and sprigs of mint.For example, fill a 32-ounce pitcher halfway with the concentrate and fill the rest with ice, or 1 cup of ice cold water and 1 cup of ice.