Okay... this is important. This is a slow cooked dish, but you have some options. The temperature is directly proportional to the time you allow the chicken to bake. While this may seem obvious, I'm going to spell it out for you.
250 Degrees F. for 3 hours
350 Degrees F. for 2 hours
450 Degrees F. for 1 hour ( I don't recommend this... but in a pinch it will work)
***************** Preheat according to your plans *******************************************
Normally, I'd tell you to have the tea sorted prior to beginning, but since this doesn't require the tea to be cool... it's okay to make it just before...
The Tea:
Boil water in a kettle... THIS is important. The water must be at a rolling boil before it is given to the sugar.
Sugar in to the sauce pan. Give the water to the sugar in the sauce pan (creating a simple syrup) Stir until the sugar is all dissolved. Then add your tea bags. Stir until you see it's nicely darkened, set aside.
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Place the chicken quarters in the casserole dish (bone side down) Do not crowd the chicken.
Pour the tea over the top of the chicken, allowing a generous well. Don't drown the bird, just allow for a enough liquid to remain in the dish while it bakes say 1/4 inch.