Thai deep-frying differs from French deep-frying in one fundamental way: the wok is the vessel, not a straight-sided deep pot. The curved sides and large surface area of the wok mean that oil temperature management in Thai deep-frying is more active — the oil volume is typically less than in a Western deep-fryer, the heat source is more intense, and the cook adjusts the heat continuously rather than relying on a thermostat. Thompson covers deep-frying in the context of specific preparations (tod man pla, hoy tod, fried garlic, deep-fried fish) but the underlying temperature management principles are consistent across all of them.
**Temperature ranges for Thai deep-frying:** - 160–165°C: for delicate items that require gentle penetration of heat to the centre before the exterior colours — frozen tod man (fish cakes), whole fish fillets. - 170–175°C: the standard Thai deep-fry temperature — tod man pla, tod man goong, crispy noodles, fried tofu. - 180–185°C: for items that require a quick exterior crust — garlic chips, shallot crisps, basil leaves. - 190°C+: too hot for most Thai preparations — the exterior burns before the interior heats through. **The wok's heat management:** The wok's wide mouth means that adding food to hot oil produces a large surface area of evaporation — the oil temperature drops more rapidly than in a narrow-mouthed pot. The Thai wok cook adjusts by: 1. Frying in smaller batches — fewer items = less temperature drop. 2. Increasing the heat immediately after adding items. 3. Removing the wok from the heat if the oil overheats (wok fires happen quickly). **The oil:** Neutral oil with a high smoke point: refined coconut oil (not virgin), refined palm oil (traditional), sunflower, or peanut. Lard is used for preparations where its flavour is appropriate (fried garlic in lard is a specific preparation). Never extra-virgin olive oil — its smoke point is too low and its flavour compounds are destroyed at frying temperature. **Testing temperature without a thermometer:** - Drop test: a small piece of spring onion green dropped into the oil. At 160°C: it sizzles gently. At 175°C: immediate, vigorous sizzle. At 190°C: rapid, violent bubbling and begins to colour within seconds. - Wooden chopstick test: dip the tip of a dry wooden chopstick into the oil. At 160°C: gentle bubbles from the tip. At 175°C: vigorous bubbling from the tip. Decisive moment: The temperature at the moment of addition for each specific item. Adding a cold tod man to 175°C oil drops the oil to approximately 155°C — sufficient for continued frying but producing a slightly softer initial crust than the 175°C crust of a small batch at maintained temperature. The professional Thai street food cook adds no more than 3–4 tod man to a wok of moderate oil volume — maintaining temperature through small batch size rather than volume.
- Fried garlic (kratiem jiaw) is the most versatile preparation in the Thai condiment arsenal — sliced garlic fried at 165°C in just enough oil to cover until pale gold, drained, spread on paper to cool (it continues to colour from the residual heat after removal — pull it before it looks done). Used as a garnish on virtually everything: khao tom, noodle soups, grilled meats. - Fried shallots follow the identical principle — rings of shallot, sliced 2mm thick, fried at 165°C until pale gold, drained. Both fried garlic and fried shallots store for 2 days in an airtight container at room temperature.
David Thompson, *Thai Food* (2002); *Thai Street Food* (2010)