TL;DR
The Acid Problem
Stainless steel and non-stick are both non-reactive to tomato and tamarind. Bare aluminium can get a slight metallic note from acid simmer. So acid rules out bare Al for tomato-heavy curries, but doesn’t choose between SS and non-stick.
The Sticking Problem
SS: Spices stick if pan isn’t preheated properly. Once the Leidenfrost preheat is hit, sticking stops. Slight fond is wanted — it becomes the sauce body. Non-stick: Nothing sticks, but you also lose the fond and depth of flavour.
Side-by-Side
| Factor | Non-Stick | Stainless Steel |
|---|---|---|
| Cape Malay tomato curry | OK (no fond) | ✅ Best |
| Durban heavy spice + meat brown | ❌ Bad searing | ✅ Best |
| Bunny Chow filling (less liquid) | ✅ Easy | OK |
| Long-simmer flavour development | ❌ No fond | ✅ Best |
| Dishwasher | Hand-wash recommended | ✅ Yes |
| Cost-per-year (daily use) | High (replace 3–5y) | Low (decades) |
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