That's fine, you can just chop half an onion if you're using about 1 cup rice. Some people omit it entirely. The mushrooms are optional or can be replaced by anything else too.
If you omit both, you've still got a creamy seasoned rice that's pretty good.
I usually use a a few cloves of minced garlic with the onion.
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Instead of throwing 2 things into a pot, you're throwing 5 things into a pot and occasionally stirring.
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That's fine, you can just chop half an onion if you're using about 1 cup rice. Some people omit it entirely. The mushrooms are optional or can be replaced by anything else too.
If you omit both, you've still got a creamy seasoned rice that's pretty good.
I usually use a a few cloves of minced garlic with the onion.