Heat the water: Bring water to a boil, then let it sit for 30 seconds. Aim for about 190–200°F (88–93°C) for a smooth brew.
Steep the tea: Add oolong to a teapot or mug with infuser.
Pour in the hot water and steep for 3–5 minutes. Taste at 3 minutes; longer steeping gives a deeper, toastier flavor.
Warm the milk: While the tea steeps, gently heat milk on the stove or in the microwave until steaming but not boiling. You want small wisps of steam, not bubbles.
Sweeten: Stir sugar or honey into the hot milk or into the brewed tea so it dissolves easily.
Start with 1 teaspoon and adjust.
Combine: Strain the tea leaves or remove the bag. Pour in the warm milk. The classic ratio is 2 parts tea to 1 part milk, but adjust to taste.
Optional finishing touch: Add a drop of vanilla or a tiny pinch of salt to round out the flavor.
Serve hot: Give it a quick stir and enjoy right away while it’s velvety and fragrant.