The shimmer test
Oil that isn't hot enough sticks. Food steams instead of sears.
Look at the surface. Cold oil sits flat. Hot oil shimmers — thin, rippling waves across the pan. That shimmer starts around 160°C. Enough for gentle sautéing. Not enough for a hard sear.
When you see it: add aromatics, softer vegetables, eggs.
The wooden spoon test
Dip the tip of a wooden spoon handle into the oil. Watch the base.
- No bubbles: too cold. Wait.
- Steady small bubbles: 170–180°C. Ready for most sautéing and pan-frying.
- Rapid, vigorous bubbles: 190°C or above. Right for deep-frying battered food.
The bubbles are steam from residual moisture in the wood. More steam, higher temperature. Reliable and fast.
The water drop test
Flick a single drop — wet fingertip, quick tap over the pan — then step back.
| What you see | Temperature | What to do |
|---|---|---|
| Sits and sputters slowly | under 150°C | Keep heating |
| Sizzles and evaporates in 1–2 seconds | 175–190°C | Ready |
| Skips across like a marble | over 200°C | Pull back the heat |
The marble behaviour is the Leidenfrost effect: a steam layer forms under the drop and insulates it from the surface. Dramatic. Too hot for most cooking.
If the oil starts to smoke
You've overshot. Smoking means the oil has already begun to break down.
Take the pan off the heat for 30 seconds. Add a splash of fresh oil. Resume.
One order that matters
Hot pan → oil → food. Always in that order.
A cold pan with oil in it heats unevenly. The oil sits too long on the metal, starts degrading, and food sticks. Heat the empty pan 60–90 seconds first. Add oil. Watch for the shimmer. Add food.
Don't crowd the pan. Cold food drops the temperature fast. Give everything space so the heat recovers quickly.
