Pour the 6 cups of water into a large saucepan and bring it to a rolling boil. Remove from heat.
Add the tea bags, cover and steep for 10 minutes.
Remove the tea bags, place the pan back over high heat and bring back to a boil.
Stir in sugar and lemon juice. Stir until the sugar is dissolved.
Reduce the heat to medium low. The liquid should just be simmering, add the plums and poach until tender. The amount of time will vary from 1 minute to longer depending on the size and ripeness of the fruit.
Remove the plums from the liquid and set aside to cool.
Continue to simmer the liquid until it is the consistency of a light syrup.
Place the plums into small dessert bowls and ladle some of the poaching liquid.