I think what she means is that Kaguya used her "power of eternity" to make it so that the dumplings never lost their flavor no matter how much you chewed them.
Reisen. Bring some of those dumplings.
Did you know there was a fire last night?Fujiwara's house caught fire, right?
I heard it's completely burnt down. Did you do it?
Yeah.
She was so hilarious that I couldn't stop laughing.
What happened?
I see...Hm.
This is flavored conservatively.
Those dumplings taste as if time has stopped for them... like for this mansion.Chomp
Huh?
Yes. Just a moment.
