There are similar old laws too still on the English statute book - if you're interested to read more here's a a recent BBC news article "Where mince pies break the law"
The members of my family who are partial to a mince pie or two over Christmas never like to eat them cold funnily enough - they always prefer them warm and served with a dollop of whipped cream or vanilla ice cream; the latter always seems to melt at just the right speed, slowly enough to enjoy the ice cream texture yet fast enough to blend in with the warmth of the pie and not give too sharp a contrast between the chill and heat factors involved. Sounds a bit scientific put that way and I suppose there is some actual science behind it all. I can imagine one day coming across a web page with a scientific equation behind why warm mince pies are great with ice cream - it may well be Professor Douglas Goff from the University of Guelph in Canada whose Dairy Science and Technology web pages are so incredibly detailed and informative, especially the Ice Cream section.