Black tea was a type of tea.
In 2153, Malcolm Reed ordered hot black tea in Enterprise NX-01's mess hall. (ENT: "Anomaly (ENT)")
In the final draft script of "Anomaly", Reed instead ordered green tea.
In 2384, Admiral Kathryn Janeway consumed black tea instead of her preferred beverage of coffee under doctor's orders. She lamented the choice to Ensign Asencia, suggesting jokingly that she might search for a second opinion. (PRO: "Let Sleeping Borg Lie")