Two possibilities come to mind:
One. it is ether the taste is mild or no extent like some prisons.
Two. or the concentration is so high that just one it enough to get poisoned
she did say it was a strong flavor but she didn't dislike it, since she was probably korean before she must be used to very condimented food? at least that's what happens in most isekai manga
Just one bite*
Maybe because she's worrying abt the first dinner with the king and didn't taste the food much... When your tensed or your mind is elsewhere you sometimes just eat and not feel or taste anything
... how did she eat so much nutmeg but was not overwhelmed by the flavour? It didn't look as if she ate a few teaspoons of pure nutmeg but just some sprinkle of nutmeg?
Oh, apparently, 2 teaspoon or 10g of nutmeg is toxic and 50g or 3.3 tablespoon of nutmeg is fatal.
In the 12th century, nutmeg is snorted ,smoked and eaten in large quantities for people to get high.
Some tikTok-ers were rushed to ER after consuming nutmeg... (~80g)
.... honestly, nutmeg is much more fatal than I expected???????