I too omitted the vinegar. Made some minor changes. I felt the filling was a little bland, I added about 2 tablespoons more chile powder and a few dashes of cayenne to kick up the heat. Overall they were pretty awesome and a huge hit at the party. If I had to find a complaint it's that the crust was a little tough, but I think that was my fault for over-thickening the filling. I think it's supposed to be a little watery to soak into the crust. Also, I made a batch in a regular muffin pan but then switched to a mini-muffin pan, which made it more of a finger food for the party.