TRGWT 18: Plum Pizza with Gorgonzola and Pine Nuts

For those of you who have been with me from the very beginning, this pizza recipe is a repeat. However, I've been asked to submit this recipe to TGRWT 18 (they go together really well contest) and am happy to do so :)This is really a great and easy recipe, and with plums widely available right now, I hope you give it a try.Ingredients1 teaspoon olive oil1 tablespoon butter1 red onion, thinly