Fill a large pot with 4 to 6 quarts of cold water. Using enough water is key to preventing the pasta from sticking together.
Place the pot on high heat and bring to a rolling boil. Do not add the pasta until the water is fully boiling.
Once boiling, add 1 tablespoon of kosher salt. This seasons the pasta from the inside out as it cooks. Do not add oil to the water, as it will prevent the sauce from clinging to the pasta.
Add the fusilli to the boiling water and stir immediately with a wooden spoon or tongs for about 30 seconds to prevent the spirals from sticking.
Cook according to package directions, typically 8-12 minutes. Stir occasionally. Start testing for doneness a minute or two before the recommended time. The pasta is perfectly cooked when it is 'al dente'—tender, but still firm to the bite.
Before draining, use a mug to carefully reserve about one cup of the starchy pasta water. This is a crucial step for creating a silky, restaurant-quality sauce.
Drain the pasta in a colander. Do not rinse it. Immediately toss the hot pasta with your favorite sauce, adding a splash of the reserved pasta water as needed to help the sauce bind to the fusilli. Garnish with fresh herbs and serve immediately.