This is about heating and searing the garlic and tomato paste for a minute to intensify their flavors. Those strong flavors are still pulsating underneath the layer of cream that connects the pasta and sauce here. To me, this is a 1988 dream dish; easy and "fancy restaurant" retro, and therefore, super chic again. This dish can be fortified with sauteed shrimp, steamed and shelled clams or any other types of seafood. If using, stir in the cooked, warm seafood at the last minute.