[Q.G.]

Right.
But if you look at the word "Baste"
there is some similarity... and I can imagine it being translated that way by...
a chef perhaps?

Actually now that I looked back at PEs post I can see where "sauce" might come from:

Begiess Zusatze (umlaut on the a)*

Yes, a chef might translate it as "baste".
But it would be putting his interpretation into the translation, that isn't necessarily in the original.
That doesn't mean it is incorrect. On the contrary: it probably is quite accurate.

*((I forgot how to make umlauts in MS Word... anyone know?))

Alt-0228 = ä
Alt-0246 = ö
Alt-0252 = ü