We really liked this. I made a few changes, starting with the way that I cooked it. I put the potatoes and onions in a frying pan with a little water. I covered them and cooked until they were nearly done then added the snow peas. When they were done I put the melted butter mixture over the top and served. I did use vinegar but I used balsamic, its what I had. We will make these again, yum.