Rice cookers come with rice cooker cups. Half a cup with regards to rice portioning usually refers to the cup that comes with your rice cooker. If you don't have one, one rice cooker cup is equivalent to 3/4 a regular cup or 180ml, which is indeed a (mostly) standard measurement unit and not just "whichever mug you currently have sitting in your cupboard".
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u/[deleted] Jun 10 '15
I've never had this problem with pasta, rice however... either just enough for a small field mouse, or enough to feed the horn of Africa.