If you want to saute the garlic, you can. You also can just simmer the liquid of choice and the saffron for a few minutes to steep out the flavor from the threads and add the garlic, tomatoes and bring to a boil.
Add the scallops with all of its juice and bring to a boil.
Add the mussels, meat side down and the parsley.
Once it comes to a boil it is ready.
Serve over cooked Linguini.