Step 1Add the sea salt to 1 gallon water in a large pot and bring the water to a rapid boil. Gently place the spaghetti into the boiling water. Stir the pasta to keep it from sticking together.
Step 2In a large skillet off the heat, combine the butter, pepper and warm water. Let stand until it's time to heat the pan.
Step 3When the pasta is cooked to the desired firmness, about 12 minutes, drain it and place it in the skillet. Saute over very low heat, gently stirring the pasta and sauce, about 1 minute. As soon as the butter has melted, turn off the heat and stir in the pecorino cheese a little at a time. Serve immediately.