Chimichurri Sauce - Easy to make in the food processor or blender, and it's full of easy, fresh, and delicious ingredients, and it's perfect for topping seafood, steak, veggies, or whatever sounds good.
Steak au Poivre - filet mignon with a cognac cream sauce and peppercorns. I've had nothing but good reviews when making this recipe. It's simple and fun. Thanks to Alton Brown's teaching, I buy the beef at Costco and trim it myself, which brings the price down too!