The direct charring of shallots, garlic, ginger, and galangal over a naked gas flame or in a dry cast-iron pan — the technique that appears in dozens of Thompson's paste, curry, soup, and salad preparations and that consistently produces a depth of flavour completely different from raw or softly cooked equivalents. The char is not a mistake to be avoided but a flavour element to be achieved deliberately. Thompson identifies this technique as one of the most important distinctions between authentic Thai preparation and simplified Western Thai cooking — the charred aromatics' Maillard compounds and smoky phenolics underpin the flavour of major preparations.
**Direct flame charring (galangal, ginger):** Hold a piece of galangal or fresh ginger directly in a gas flame with tongs. Rotate to char the exterior on all sides — the skin should be fully blackened. The interior cooks from the heat passing through the charred exterior. Allow to cool, then peel away the blackened exterior. **Dry-pan charring (shallots, garlic, dried chillies):** Place unpeeled shallots or unpeeled garlic cloves in a dry cast-iron or heavy stainless pan over medium-high heat. Leave without moving until the underside is charred — 3–4 minutes. Turn. Repeat on all sides. The interior should be completely soft and cooked through by the time the exterior is charred. **The flavour transformation:** Raw garlic in a dish: sharp, sulphurous, aggressive. Charred garlic in a paste: sweet, smoky, with a depth that integrates rather than punctuating. This is not subtle — the difference is dramatic and immediately perceptible. Decisive moment: The interior cooking through during the exterior charring. Shallots that are charred on the outside but raw on the inside produce a paste with the char's bitterness combined with the raw shallot's sharpness — the worst of both. Apply sufficient heat long enough that the interior has cooked through to a soft, caramelised consistency while the exterior is fully charred.
*Thai Food* (2002); *Thai Street Food* (2010)