Place sliced strawberries, blackberries and sugar into a quart jar.
Juice the orange into the jar.
Stir to combine and let sit at room temperature for 10-15 minutes.
Muddle the mixture to completely crush the berries.
Add honey and set the berry mixture aside.
Bring water to a boil.
Remove from heat and add dried hibiscus flowers and fresh mint to the hot water.
Let mixture steep for 5 minutes.
Strain out the flowers and mint.
Pour half of the hot tea into the quart jar with the berry mixture.
Stir until the honey has dissolved, then add in the rest of the tea.
Cover and place the jar in the refrigerator until it has cooled completely. (At least 3-4 hours, preferably overnight.)
Shake the jar well before serving the tea in highball glasses over ice.
Garnish with a sprig of fresh mint.