[black-tea]

It doesn't make sense, but it is a pattern. There is a similar pattern in French: all nouns ending in -tion or -sion are feminine (apart from a single exception: le bastion). Handily we also have most of those nouns in English too.

When learning French I stopped searching for patterns in genders. Some are truly weird, like penis being feminine and vagina being masculine. But I told myself it's no different to having to remember the pronunciation of every single English word, so my brain easily has capacity for it. After a while it becomes just as natural.