Canned tuna is one of those staples that every home cook should always have in ample supply, for creating a wide variety of so-called pantry meals from what's on hand. This recipe fits the bill perfectly, using only basic items including spaghetti, olive oil, shallots, garlic, and herbs (plus pepper). Flake the tuna before adding it to the pasta (along with the shallot mixture), so it is more easily and evenly distributed.