Step 1

Cook the pasta al dente in salted water according to the instructions on the package. Reserve 1-2 cups of pasta water before draining.

Step 2

Meanwhile, heat the olive oil in a large pan or Dutch oven and melt the butter in it over low-medium heat.

Step 3

Stir in the garlic and red chilli flakes and cook for 1-2 minutes until the garlic changes its colour, careful not to burn it.

Step 4

Transfer the cooked pasta to the pan and toss well with a pair of kitchen tongs to cover it in the butter sauce. Add a splash of pasta water if it looks too thick.

Step 5

Stir in the lemon zest and juice, then add the Parmesan and toss well to combine.

Step 6

Add the chopped parsley, season to taste and serve immediately, topped with additioanl grated cheese and lemon zest if you like.