What is the advantage of a steel skillet over a cast iron one? I currently use cast iron for most everything and am curious what I might be missing.
Pan sauces made with wine, vinegar, or any other acid are better in stainless steel. If you put any acid in cast-iron, you are harming your seasoning, and leeching iron into your food. This will affect the taste of your sauces, I find pan sauces taste metallic when made in cast iron.
Stainless steel also heats up and cools down much faster than cast-iron. This is great when you need quick heat, or fine control of your heat. You can also plunge a piping hot stainless pan into an ice-bath without cracking it in half.
If there's an advantage to getting a steel skillet as well, what would be recommended?
Go with a a bonded stainless-steel pan with an aluminum core. The most well known manufacturer is All-Clad. The stainless steel exterior is great due to it's non reactivity, you can literally put anything in it. The aluminum core distributes the heat much more quickly and evenly, minimizing hot-spots.
Is a steel skillet good for cooking omelettes?
Not in my opinion. I go with a non-stick pan every time.
I have to recommend sticking with a nonstick pan for eggs. There's simply nothing better, although well seasoned cast iron comes awful close. If you're spending more than $20 for a nonstick egg pan, you're doing it wrong. You don't need Calphalon, or any other big name for a good nonstick pan. Go to a restaurant supply store if you can and buy a cheap one there. With care it should last you 2-5 years depending on use. I found my current one at a Bed Bath & Beyond.
Modern stainless steel pans with clad bottoms can be as good as copper pans. McGee developed a simple technique to test the heat distribution where he fits a piece of paper to the bottom of the pan, placing the pan over a burner and carefully watching how the paper browns. Thick aluminum, clad bottom stainless, and copper all worked equally well.
There are differences that relate to the techniques used in cooking. A thin copper pan is great for melting butter or chocolate straight on the burner. Modern air-gap wall stainless steel pans hold the heat better and work better for simmering or boiling. Copper is harder to upkeep.
Pans will develop hot spots, even copper which is the better conductor. Until we get graphite added to the cladding or some other exotic material to distribute the heat, thickness will matter the most for even heat distribution.
I have read several consumer tests and reviews of pans and they fail to note that thermal conductivity and thickness can both be used in practice to balance the temperature distribution and heat flux in a pan.
Best Answer
Copper can be useful for certain tasks due to the its metallic properties (heats quickly, distributes heat evenly, etc.), however I would not call copper pans good "all-purpose" pans.
As for cast iron, you mentioned Le Creuset, and again I would tell you that they are more of a specialty manufacturer. They make some very nice coated cast iron-ware and fantastic large pots, but they're not really the go-to for a simple cast iron pan.
For basic cast iron, go buy a Lodge skillet. They're around $20 depending on size, and will literally last a lifetime. The company has been making these pans for 115 years; they know what they're doing. I use mine 3-4 times per week, and cook almost all my meat in it. It tastes better after every use.