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Proceed to chop an onion by making a slit and peeling off the outer layer while retaining the root. This technique minimizes crying and waste. Halving the onion and cutting it crosswise will yield nicely minced pieces that enhance the dish's flavor.
Mushrooms can be sliced as well; they are optional but often add depth to the flavor profile. Regardless, including whichever vegetables you prefer allows for a personal touch in the recipe.