Factory pasteurization cooks shelf-stable sauces under high heat inside closed jars. This thermal cycle dulls fresh garlic aromatics and flattens tomato brightness. Fixing these flaws takes less than five minutes on your stove.
Begin by blooming aromatics. Warm two tablespoons of olive oil over low heat. Add a smashed clove of garlic and a teaspoon of Calabrian chili paste or crushed red pepper flakes. Let the chili fry gently for 60 seconds until the oil turns orange, then discard the browned garlic clove. Pour the jarred sauce into that seasoned fat.
Always preserve your starchy pasta water. Before draining the pasta, ladle out half a cup of the cloudy, salted water. As the cooked pasta hits the skillet with the sauce, splash in two to three tablespoons of that cooking liquid over high heat. The gelatinized starches bind to the fat molecules in the cream, producing a mirror-like glaze that clings tightly to every ridge.
Kill the heat before adding dairy or cheese. Stirring in two tablespoons of cold unsalted butter and a generous half-cup of freshly grated Parmigiano-Reggiano off the burner ensures the cheese melts smoothly into the sauce rather than clumping into stringy ropes.
