Originally Posted by Shmohel
What is a milk stout? Not familiar with the style, can you explain?
Milk Stout is a fancy name for a sweet stout. It is typically sweetened with lactose, which is an unfermentable sugar from milk solids. The yeast can't eat it and turn it into alcohol, so the sugars from the lactose stays in the beer after complete fermentation.
Typical commercial example is Mackeson's XXX. I'm not a big fan of it but a guy had a coffee-toffee milk stout at the NHBC and it was amazing. Breakfast beer. Dump that on pancakes (or ice cream) and you've got something very nice.