Contrary to the name of this drink, it contains absolutely no tea. It is instead a mixture of a number of different types of alcohol. The “tea” name comes from the lemon juice giving a strong citrus flavor and the dark cola giving it a color similar to tea. This is a crisp drink I like on a hot day, but usually would turn to a margarita in those cases due to the potency of this drink.
A full written recipe may be found here: https://cook.karylstein.com/g/family/r/long-island-iced-tea