It's a loose definition of tea. You get a small saucepan of water to a heavy simmer. Take the spices,herbs,etc & put them in a hop sack (the little ones),& drop it into the simmering water.
Simmer until the liquid has some good color to it. About 15-20 mins. Remove sack,take it off the burner,& allow to cool with a lid on it to keep the lil nasties out. Then just pour it into the beer in your secondary.