A delicious way to use up bits of leftover cheese, and spinach that's getting past its best. The walnuts give it a beautiful crunch and make it extra special. The pie crust doesn't need blind-baking—perfect when you're in a hurry. The pastry is quick to make, but needs resting time in the refrigerator. You will have enough pastry left over for at least one more tart; it freezes beautifully. The tart serves 6-8.

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