Seder = סדר
Mei melach (מי מלח)
It is the blessing over the occasion, used during any special occasion.
You would say "hah-m'dah-BEHR ah-TEM eev-REET ?" We're curious ... If you don't know how to say that, then why would you ever need to ??
to a male: atah medaber ivrit (אתה מדבר עברית)to a female: aht medaberet ivrit (את מדברת עברית)