Chipper's Dozen

Just as a Baker's Dozen historically refers to 13 (typically as bread rolls), A Chipper's Dozen refers to some number greater than that which was ordered, typically applied to Potato Cakes / Potato Scallops / Potato Fritters. In any such case, the customer will order and pay for some number of these fried delights and typically receive something like 1.3 to 1.5x that number. More typically this applies to an order less than a dozen, so it is more useful (though more cumbersome) to describe a "Chipper's half-dozen".