Boil filtered water.Oolong is best brewed at 185°F - 208°F water temperature. Check your tea packaging and set your electric kettle to that water temperature.
Warm up mug.Pour some hot water into the mug and swirl it around then discard the water.
Put 2 teaspoons of loose oolong tea into mug with an infuser.If using a tea scale, weigh 6 grams of tea.
Add hot water and steep for 5 seconds. Fill the mug halfway and swirl the hot water around. After 5 seconds, take out the infuser and throw out the water. This is called a rinse. It's to wake up the tea leaves and to get it to start unfurling.
Add 1 cup water and cover teapot. Steep tea for 45 seconds.Make sure the lid is on while the tea steeps.
Take out infuser and drink.
Steep tea again in hot water for 1 minute and 15 seconds.Once you've finished your cup, put the infuser with the tea back in and add another cup of hot water. Steep then take out the infuser and drink again.
Optional -- Steep tea again in hot water, adding 30 seconds to the previous steep time.You can steep tea a few times until the tea loses flavor.