Scallion Oil

Trim and wash the scallions thoroughly — any trapped moisture will cause the oil to splatter aggressively when they hit the pan. Pat completely dry with paper towels, or better, lay them out for 30 minutes to air-dry. Combine the oil, whole scallions, and ginger slices in a cold wok or medium saucepan. Place over medium-low heat. Starting cold is essential — it gives the scallion and ginger time to slowly release their volatile aromatic compounds into the oil before any browning occurs. As the oil heats, the scallions will begin to wilt, then soften, then bubble. The bubbling is the water content of the scallion cooking off — as long as it is bubbling vigorously, the temperature will stay below browning. Let the oil slowly infuse for 10–12 minutes, turning the scallions occasionally with tongs.

After the initial infusion, increase the heat to medium and allow the oil to continue cooking the scallions until they transition from jade-green to a pale golden-yellow, with the edges beginning to show the first signs of browning. This stage takes 5–8 minutes after the heat is raised. Watch for the moment the vigorous bubbling slows — this means the scallions have lost most of their moisture and are now beginning to actually fry in the oil rather than steam. This is when browning accelerates rapidly. As soon as the scallions are golden-yellow with pale amber tips, remove from heat — they will continue to cook in the residual heat of the oil.

Remove the pan from the heat and immediately stir in the salt — it will dissolve into the hot oil and season it throughout. Let the oil cool slightly for 2–3 minutes (the scallions will continue to cook in the residual heat, deepening slightly from golden to pale amber). Then strain the oil through a fine-mesh sieve into a clean heat-proof jar or container, pressing gently on the solids to extract every drop of flavored oil. Discard the spent scallion and ginger solids — they have given everything to the oil and have nothing left to offer. Let the oil cool to room temperature before sealing. It keeps refrigerated for up to 3 weeks and solidifies slightly when cold; bring to room temperature before using. Drizzle over cold noodles, steamed fish, congee, or use anywhere the gentle, sweet fragrance of scallion should be present without the texture of raw scallion.