This half of a Pogo cartoon strip by Walt Kelly says it all:
Photographed from the framed original on display at the Mustard Museum in Mount Horeb, Wisconsin.
Why is that cartoon at the Mustard Museum? The other half of the strip mentions mustard twice, and the Mustard Museum has diverse things mentioning mustard...
... plus a lot of mustard:
In case you're wondering about the second half of the strip: The mouse goes on to say, "Bong! Bong! Bong! Corned beef on rye on the nose and all is mustard." The alligator (Albert) says, "A delicious time of day." And the rabbit says, "Some time call! Corned beef on rye on the nose an' all is mustard! What's that amount to?" The mouse answers, "To you, a buck fifty, with java, two clams even." So the old Father Time character says, "Strike that liberal."
IN THE COMMENTS: More than one commenter doesn't understand the comic strip, and I explain it here.
And here's a link to the Mustard Museum website.