Prepare the garlic and parsley. Finely chop a small sprig of parsley to give about 4 teaspoons of finely chopped flat-leaf parsley. Peel and crush 2 to 3 cloves of garlic using a garlic press. Alternatively, finely chop the garlic.
Boil the water. Put about 6 to 8 pints (4 to 5 litres) of water in a saucepan and bring to the boil. Add a generous amount of salt. The amount will vary according to the type of salt used but as a guide about 1 ½ tablespoons of coarse grain salt. The saying goes that the water should be as salty as seawater.
Cook the pasta. Add the fusilli pasta to boiling water and cook for a couple of minutes less than indicated on its wrapping, then start testing the pasta. Aim for an al dente texture, meaning that it still has a little bit of texture to bite into, and under cooked rather than overcooked. The pasta will continue to cook when added to the butter sauce. While the pasta is cooking prepare the butter sauce.
Melt the butter. Over a low heat, melt 4 tablespoons of butter in a large saucepan or sauté pan. Take care not to overheat the butter, if you see any signs of bubbling or small specks forming in the butter remove the saucepan from the heat.
Fry the garlic. Add the crushed garlic to the melted butter, stirring it in well. Over a very low heat, fry the garlic just until the aroma of the garlic is released (about 1 minute) and then remove the saucepan from the heat.
Drain the pasta, set aside some pasta water. Remove and keep aside about 1 ladleful of pasta water. Drain the pasta.
Combine all ingredients. Over a very low heat, add 1 or 2 tablespoons of the reserved pasta water to the melted butter sauce, stirring in rapidly so that the water combines thoroughly (emulsifies) with the melted butter. Take the saucepan off the heat and, stirring in gently, add the cooked pasta, 2 teaspoons of the chopped parsley and salt and pepper to taste. If the pasta needs a little more cooking for your preferred texture, add a little more of the pasta water stirring it in well and cook over a gentle heat.
Ladle the pasta onto serving dishes. Sprinkle with the remaining chopped parsley. I will sometimes top with a knob of soft butter for an extra buttery finish. Is there such a thing as too much butter?