it's because using metal will cause the lettuce to wilt sooner. Try cutting with a plastic knife or simply tearing the lettuce and it will last longer, too!
i worked a pretty nice restaurant and we used stainless steel bowls for salads. Having said that, I have heard that some ingredients may react to the metal in metal bowls. It's not that big of a deal... if you look in a culinary text book you would be amazed by all different recommendations they have... wood for this, metal for that... I have also heard that cutting lettuce will make it brown more quickly, which may be true, but even at a nice restaurant we couldn't afford to tear up lettuce for salads. Wood for this, metal for that... doesn't really mean much to me or the home chef, IMO.
Why aren't you supposed to use metal when mixing salads? I've been making salads probably 5 out of 7 days a week (unless I'm on vacation) for 43 years) & I've never had a problem. I'm very curious as to the logic of this.
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