Leftovers can be kept in an airtight container in the refrigerator for 3-4 days. It is not recommended to freeze leftover pasta due to texture changes. Reserve a cup of pasta water before draining to adjust sauce consistency. When cooking shrimp, aim for just until they turn pink. Remove them promptly to avoid a rubbery texture. For a different taste, consider scallops or chicken instead of shrimp for your pasta dish. If the tomato sauce tastes overly acidic, try adding a pinch of sugar or a splash more cream for better flavor. For a texture variation, feel free to swap in short pasta shapes like fusilli or conchiglie in place of penne. Reheat on the stovetop over low heat, stirring occasionally, until warmed through, about 5-10 minutes. Pair with a simple side salad like Caprese. Serve with crusty bread to soak up the sauce. Accompany with white wine for a complete meal. Add spinach or kale for added greens. Incorporate sun-dried tomatoes for extra flavor. Replace shrimp with lobster for a luxurious twist.