Fry the vegetables. Place 1 tbsp of butter in a small frying pan. Fry the onion until golden brown for 5 minutes. Set the pan aside. Coarsely chop the chanterelles. Melt 1 tbsp of butter in a separate frying pan and fry the mushrooms for 10 minutes.
Finish cooking. When fried, the chanterelles release juice. Pour it into a separate bowl – you will need it for the sauce. Add the remaining butter to the pan with the chanterelles and fry for another 15 minutes. Season with pepper and salt. Add the fried onion and the juice obtained during the frying process. Stir.