The onions are sauteed until caramalized, and add a full and rich flavor offset by the creamy Gorgonzola, the toasted walnuts and the earthy sage. You can make the confit in advance. You can make your own pizza dough, buy it in the grocery store, or sometimes your local pizza place will sell you some. For a delicious variation, use basil instead of sage. Adapted from Fields of Greens cookbook.