Nothing at all. It'd be hard to taste without a tongue.

[But that doesn't mean he's excused from saying blessings over it, though he does it quietly.] בָּרוּךְ אַתָּה יְ‑יָ אֱ‑לֹהֵינוּ מֶלֶךְ הָעוֹלָם שֶׁהַכֹּל נִהְיָה בִּדְבָרוֹ. [And he sips his tea.]