1Place a large pot of water over high heat, put on a lid and allow it to come to a boil.
2Prepare the garlic by laying it on its side and pushing down to crush it, removing the cloves.
3Remove the woody tips of the garlic cloves.
4Peel the garlic cloves.
5Thinly slice the peeled garlic cloves.
6Remove one end of the lemon to allow it to sit flat.
7Slice off the zest of the whole lemon, being gentle to avoid removing too much pith.
8Slice the lemon in half; only the juice from one half will be used.
9Remove any extra pith from the lemon zest.
10Thinly slice the cleaned lemon zest using a julienne cut.
11Juice half a lemon; save the other half.
12Roughly chop 10g of parsley.
13Generously season the boiling water with salt and add in 400g of spaghetti. Cook for one minute less than package instructions, until al dente.
14Place a large pan over medium-high heat. Add 1 tablespoon of olive oil and 1 1/2 tablespoons of unsalted butter, and allow the butter to melt.
15Add in the sliced garlic and a pinch of sea salt flakes. Gently fry for one minute, ensuring the garlic doesn't brown too much.
16Add in the thinly sliced lemon zest and lemon juice. Continue cooking for another minute, mixing occasionally, until the lemon juice slightly reduces.
17Add in one cup of thickened cream (or any cream with a fat percentage of about 36%). Season to taste with cracked black pepper.
18Mix well to combine the flavors and bring to a light boil. Reduce heat to low and allow to simmer to thicken.
19Transfer the cooked spaghetti from the pot into the sauce, bringing along a little pasta water to help the sauce stick to the pasta.
20Add the chopped parsley (save some for garnish). Fold everything together and cook for one minute to finish cooking the pasta and thicken the sauce.
21Remove from the stove top. Serve in bowls, plates or straight from the pan.
22Garnish with lemon zest and remaining parsley. Grate fresh parmesan cheese over the pasta and add cracked black pepper.