Because their recipes are not presented in the standard blog format of most recent at the top of the blog, Food52 supplied us with the recipe links for all their back catalog. Which was great but we then didn't have an easy way to retrieve all the recipes added after that. We have now written a program to import new recipes as they are added but it only went live last night and I have a backlog to clear up.
So you should see all the recipes up in the next day. Well, actually, we will never have all Food52 recipes as they only wanted us to list the winners, runners-up and editors' picks as the other recipes listed are untested.