https://www.etymonline.com/word/toast

The word is from Latin tostere, meaning roasted, burnt (referring to bread.

Also

Tostie is attested from late 14c. as "toasted piece of bread, dish made with toast

But you clearly have some really funny joke going on with yourself so I won’t stop you

Unless you’ve had proper ruisleipä you can’t talk. Have a tosi tumma reissumies or some saaristolaislimppu and then we’ll talk about bread