Can one put cheese in a soup that was cooked in meaty pot?
Answer:
If the meaty pot was not used for 24 hours for meat, cheese may be added. According to some authorities one should not make such a soup with intent to later add cheese. If onions were first cooked in the pot alone, they are meaty and cheese may not be added.
Sources:
see here: dinonline.org/2010/04/15/pareve-food-cooked-in-a-meaty-pot/
