Several times over the past few days I have spent 10 minutes or so dipping chunks of pretzel into Miller's Mustard.
Now, it's nothing like your traditional mustard, whether that be Gulden's, French's, Dijon, Hebrew National deli mustard, or what have you.
That said, it's quite good. Spicy, tangy, with just enough traditional mustard taste to rightfully call itself a mustard.
And it's made in Gibsonia. You can find it at Save on Beer in Cranberry and McGinnis Sisters in Seven Fields.