Milk should be added at the last possible moment before drinking, so the tea stays as hot as possible. Also, ensure to use freshly boiled water as it helps the flavours spread through the liquid.
Non-diary milk such as oat milk tends to add a good flavour to teas.
Tea tastes best in cups from inert materials like ceramic or glass. Styrofoam cups are porous and will absorb some of the flavour compounds and affect the taste. Plastics can also absorb flavours.
There is also psychology involved in the way we perceive taste. Hot drinks taste sweeter in a red or orange mug, and drinking from a fine bone china cup will taste better because it feels more special.
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