The first one that comes to mind is a dish of calamari and scungilli (sometimes also gamberi) in a garlic marinara with fresh basil. You slice the garlic into chips, then lightly fry them in evoo. Next, a little anchovy paste is stirred in, then the marinara sauce added and simmered until really thick.
Finally, the seafood is added to the thick, bubbling sauce and cooked just until done. The reason to thicken the marinara is that the seafood releases its liquid into the sauce as they cook, thinning it back to the right consistency.
Finally, fresh basil is torn and sprinkled on top.