Spaghetti aglio, olio e peperoncino

Spaghetti aglio, olio e peperoncino is the ultimate test of a cook's skill precisely because it has nowhere to hide—four ingredients, five minutes of active cooking, and either transcendence or failure. This is Naples' midnight pasta, the dish that feeds you when the cupboard holds nothing but dried spaghetti, garlic, olive oil, and dried chilli, yet in the hands of a skilled cook it achieves a depth of flavour that shames more elaborate preparations. The technique is everything. Garlic—at least two large cloves per serving, sliced impossibly thin—is cooked in abundant extra-virgin olive oil over gentle heat until it turns pale gold and releases its sweetness. Too little heat and the garlic stays raw and harsh; too much and it turns bitter and acrid, ruining the dish irretrievably. The peperoncino is added to the oil along with the garlic, its seeds removed or retained depending on the desired heat level. While the garlic cooks, spaghetti boils in aggressively salted water until very al dente. The critical moment is the mantecatura: pasta is transferred directly to the garlic oil using tongs, bringing along a generous amount of starchy cooking water. The pan is then tossed vigorously over heat as the water and oil emulsify into a creamy, glossy coating. This emulsion is the dish's soul—without it, you have oily pasta with garlic bits. The parsley, finely chopped, goes in at this stage. The pasta must be served immediately—it cannot wait. Some cooks add a splash of raw oil at the end for fragrance. No cheese, ever. The dish's reputation as simple belies its role as a diagnostic: professional kitchens have been known to use it as an interview test, because the timing, temperature control, and emulsification skills it demands are the foundation of all pasta cookery.

• Chinese oil-tossed noodles (yóu pō miàn)
• Spanish gambas al ajillo (garlic-oil principle)
• Provençal aïoli logic