Olive Leaf Tea can also be brewed cold. The leaves go into cold water and steep for several hours in the fridge. Cold brewed tea tastes milder and softer than hot brewed tea, and the bitterness takes a back seat.
Here is how: put about twice the amount of leaves you would use for hot tea into a jug of cold water, leave it to steep in the fridge for 8 to 12 hours and strain. With lemon, mint or a few ice cubes it becomes a refreshing iced tea for warm days.