Place the clams in a large bowl and cover with cold water. Set aside for 1 hour to purge them of any sand and grit. Drain.
Bring a large saucepan of water to a lively boil and season as salty as the sea. Add the pasta and cook until al dente.
Meanwhile, heat the olive oil with the garlic in a large frying pan over low heat, until starting to warm – not hot, do you hear me? Garlic burns fast and if you add it to already-hot oil, the outside will brown before the inside has had a chance to cook. Cook, stirring constantly and keeping an eye on it, for about 5 minutes or until fragrant and beginning to colour. Add the butter, along with the sambal oelek, and allow to melt.
Add the drained clams and increase the heat to medium.
Pour in the wine, then cover and leave for 2 minutes or until most of the clams have opened.
Drain the pasta and add it to the opened clams. Discard any clams that have not opened. Toss well and leave for a minute, then stir through the parsley, lemon zest and juice.
Transfer to a big serving bowl and dig in.