My kids were doing some late night cooking and by mistake they cut up an onion with a meaty knife, fried the onion in a milky frying pan and cooked it with noodles and eggs. (only parev food) They ate the food and realised their mistake after.
Both the knife and the frying pan had not been used for meat/milk in the last 24 hours.
Does the frying pan need koshering? It’s a coated pan.
Yes, the pan needs to be kashered.