Saffron is just one of the many spices you can include in your recipe. It is commonly featured in Asian, European, and North African cuisines, but it does not necessarily mean that other cuisines cannot include this spice in their own recipe.
Here are some of the recipes which call for the use of saffron: Risotto Milanese, wild mushroom risotto, saffron basmati rice, shrimp risotto, chicken paella, seafood paella, seafood risotto, Thai vegetable soup, lamb tagine, Mexican rice, Indian saffron rice, Kashmiri lamb, chicken biryani, saffron bread, bouillabaisse, and Swedish saffron buns. There is no specific recipe that requires the use of saffron because it can be altered, but if you want to taste the bitter mint of hay and a honey-like aroma, then use saffron.