Aha !! I figured it out!

Our rambunctious friend popped in just a few minutes ago, fresh from the Post Office, and flapping this folder of photographs at us while uttering hoots and hollers heard form miles.

"I saw the picture in your previous post and I got it", he claimed. "I know the wines you will be serving".

So he showed us this mustard picture - white mustard he claimed - to go with the clue on the table in the prior post.  But not just any white mustard...and then he proceeded to give us a couple more clues that he suggested for us to post up to see if anyone could tumble to the subject of Saturday's tasting.  Well, here they are -

He told us that you had to know your rivers and how you could actually get from the North Sea to the Black Sea and pass right though and sample the wines we were going to put out and instead of a rich rye bread to cleanse the tongue, we would do well with the food in prior post and the white mustard (NOT BROWN that we would use if we were hoitie toitie Frenchmen).

He went out humming a little song.  ....  See you Saturday. We'll drop another clue of our choosing tomorrow.