Celery, Chicken & Leek Quiche with Sun-Dried Tomato Sauce

The quiche of my youth is ready for a comeback—or maybe more like a graduation day. This savory custard is what I like to call the perfect “seasonal transition dish,” and it’s known as my fall quiche. I adore how the sun-dried tomatoes echo the flavors of summer, while the leeks announce that it’s already October. Emmental and Gruyère are both great, but good old American Swiss-type cheese does the job, too, and when served with a farm-fresh salad or roasted root vegetables, you have a very