Pomkot leaves
Pomkot was a plant native to Vulcan. Its leaves were used to brew a type of Vulcan tea; when preparing the tea, the hot water needed to be poured slowly over the leaves, or they would fail to bloom.
In 2259, Spock prepared tea from pomkot leaves, in accordance with T'Pring's family's recipe, for Sevet and T'Pril during their V'Shal dinner. (SNW: "Charades")