Sorry, but I don't have a magic bullet for this one. We do exactly as Little Chilie says. You can cook double or even treble portions to speed things up but I don't usually bother because it just leads to mistakes. I spent weeks trying to create bulk recipes but failed completely - even simple sauces like a korma just didn't come out right. I know a guy in Thailand who runs a BIR business with a much bigger throughput than ours, and he and his staff cook portion by portion in normal chef's pans.
The only cheat I have is to run two pans at once. With two chefs working side by side we can cook pretty fast, but you have to try to stagger the start of each pan or you get in each other's way.
We also - for very big orders - cook the sauce and protein separately. This speeds things up but it's more about food safety as it avoids food sitting around waiting for the chiller to come free. The results are not 100% as good as cooking it all together, but are quite acceptable.
If anyone has some tips of their own I'm all ears. I have always said that if you could crack this, the Tesco contract alone would be worth millions
