Prawns: use a chopping board and clean hands to prepare the prawns. Start by twisting the heads off the prawns, then removing their tails. Then peel the shell and remove it and the legs. Then use a small knife and cut along the back of the prawns and remove the digestive tract. Repeat this process for all prawns. Once done, rinse them and use paper towel to pat them dry.
Butter, garlic and salt: place a large sauté pan on the stove, turn the heat to high and add the butter. Allow this to melt and then add the garlic and salt. Cook for 1 minute, stirring as the garlic softens and turns golden brown.
Cream and cheese: next turn the heat to low and pour in the cream, use a wooden spoon to stir this then add the parmesan cheese and continue to stir until it has melted.
Fettuccine: read and follow the package instructions to cook the pasta in a medium pot of boiling salted water. Moments before it is al dente (a little bit chewy if you taste a bit) use a heatproof jug to scoop out and remove 1- 2 cups of the pasta water. Then use a colander over the sink to drain the rest of the pasta and discard the water.
Combine: give the alfredo sauce another stir to combine then add the hot drained pasta to the pan. Then measure and pour in ½ cup (125 ml) of pasta water. Next add ½ cup of finely chopped parsley and use a pair of tongs to toss and combine.
Cooked prawns: then add the cooked prawns back to the pan and gently fold into the pasta and sauce. Allow these to heat through.
Garnish: generously garnish the dish with a sprinkling of black pepper, parmesan cheese and additional chopped parsley. Provide plates and spoons for serving.