You can find most of the traditional Bulgarian recepies translated in English:
http://www.passionateaboutfood.net/bulgarian.php
http://www.visittobulgaria.com/faq/SiteMap.asp?d=faq-recipes
There are also some Bulgarian cook books in English that you can buy like this one: http://www.findbgfood.com/cookbooks-bulgarian-cookbook.htm
Either of these won't help you learn Bulgarian anyway :)