I must be missing something. If you back out salt, pepper, and other seasonings (which is what Shel set up as the criteria), most recipes have five or fewer ingredients. Or, if not most, certainly a great percentage of them.
F'rinstance, last night I made broiled mahi mahi in a papaya port sauce. Not counting seasonings all it called for was the fish, papaya, butter, and port.
I just pulled some of my recipe cards at random. Three out of four were 5 ingredients or less, plus seasoning. Among them:
Morracan Tagine of Chicken with Prunes (chicken, onions, prunes, fresh ginger, seasoning)
Southern Style Smothered Pork Chops: Pork chops, onion, applie juice, chicken broth, oil, seasonings.
Bubble & Squeak: Boiled beef, cabbage, vinegar, seasonings.
Herbed Lamb Rounds: Bulgur, ground lamb, garlic, olive oil, seasonings.
Tandori Chicken Kababa: Yogurt, lemon juice, chicken, cauliflower, bell peppers, seasonings.
Etc. etc. etc.
If you stretch the definiation of "seasonings" to include garlic, citrus juices, and other elements there just for flavor (such as fresh ginger) many recipes call for only two or three ingredients.
On the other hand, many of my recipes, which include 6, 8, 10 or more ingredients, are not particularly complex to make. So I don't think the number of ingredients really has much to do with simple & easy to prepare.
Indeed, going through Alice Waters' new book, "The Art of Simple Food" there are many recipes with more than five ingredients. Even something as easy as her Cranberry Bean Gratin, has 8 ingredients, plus seasonings. But it's a fairly simple dish.