The Wales the True Taste (http://www.walesthetrueta...) campaign has been very successful in promoting the use of local ingredients in recent years, and even fairly low-key restaurants and pubs will often have a sign telling you where all of their ingredients are sourced.
Perhaps the most high-profile local ingredient is lamb, you certainly won't spend long in North Wales before you see your first sheep! All the post-Chernobyl restrictions on welsh lamb have finally been lifted 2012. Artisan cheeses abound, look out for the Snowdonia Creamery range, among others. Fresh, local seafood can be excellent, especially on the Lleyn.
