Can onions be used in place of leeks in a recipe?

Yes, onions can be used in place of leeks in a recipe, but the flavor will differ slightly. Leeks have a milder, sweeter taste compared to onions, which are more pungent. If substituting, consider using a smaller amount of onion and cooking it gently to soften the flavor. Adjusting the seasoning may also help achieve a closer flavor profile to the original dish.