Cook pasta al dente: To prevent the pasta from becoming too soft, cook it al dente. When mixed with the sauce, it will continue to cook slightly.
Use fresh parmesan: Freshly grated parmesan cheese melts better and adds a richer flavor than pre-grated cheese.
Adjust spice levels: Taste the sauce before adding the crushed red pepper flakes and adjust to your preferred spice level.
Wilt spinach separately: If you prefer, wilt the spinach separately and add it to the pasta just before serving for a more vibrant color and texture.
Save pasta water: Reserve a small amount of cooking water before draining. Adding a splash of this starchy water to the sauce can help it cling to the pasta.
Garnish just before serving: Add fresh herbs and extra parmesan to maintain their flavor and texture.
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