Vegetable

For a less formal but equally appealing presentation, you can spoon rather than pipe the filling into the shells.

You can make the dressing through step 2 a day ahead; refrigerate in an airtight container. Just before serving, stir in oranges, pine nuts, and parsley.

Using a mandoline to slice the potatoes is quick and easy. You can do so up to four hours ahead; to prevent browning, place matchsticks in a bowl of cold water in the refrigerator until ready to use, then pat them dry with paper towels.

This recipe can be made a day ahead and refrigerated; reheat before serving.

This recipe can be made a day ahead and refrigerated; reheat before serving.

Use a mandoline or a very sharp knife to cut the celery and zucchini.