The Virtual St. Joseph Altar has a recipe page listing some of the more traditional recipes used on Altars.
Catholic Cuisine has a nice article that also includes some staple recipes.
Even Food.com has a St. Joseph Day Altar cookbook!
If you are looking for more recipes, keep in mind that those who donate $25 or more to the Virtual St. Joseph Altar will receive a digital copy of Viva San Giuseppe, A guide for Saint Joseph Altars. With over 40 pages of recipes, stories of faith, Altar background, and history, this little out-of-print booklet is a handy reference for anyone setting up a St. Joseph Altar. Delivery to your inbox -- all you need to do is print.