pasta rule
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Or you could use the hole in your spoon, which is approximately one serving...
Nah - That requires me to own a stigmata spoon and I don't bring religion to my cooking.
If you're out buying stuff you can buy one with different serving sizes for each hole. Seems handy for that one time, after that you already have an idea of how much 'getti you need.
Or well, OP doesn't but still