We streamlined this usually complicated Paella dish by using a deli-roasted chicken, minced garlic from a jar, frozen vegetables, and packaged saffron rice. You can buy bags of mussels at your local seafood counter. Rinse them, and then pull off any remaining pieces of the stringlike beard. Discard any mussels that don't close when you tap on them. If you can't find mussels, add an extra 1/2 lb. of shrimp.