Blend flour and salt in a food processor. Add butter and shortening and pulse until mixture resembles coarse meal. Add 6 tablespoons ice water and process until moist clumps form, adding more water by teaspoonfuls if dough is dry. Gather into ball and flatten into a disk. Wrap in plastic wrap and chill for 2 hours.
Preheat oven to 400F. Prepare a 8 or 9 inch tart pan with cooking spray. Roll out pastry and place into the tart pan; trim, leaving 1-inch overhang. Fold inside rim and flute edge. Prick all over with fork.
In a small bowl, combine the ricotta, mustard, pesto and parmesan, adding a little salt and pepper to taste. Spread this mixture over the bottom of the prepared tart shell. Cover with plastic wrap and refrigerate while you prepare the vegetables. Cut the carrots, eggplant and zucchini and cut in lengthwise strips using a peeler or a mandolin slicer. Cut so as to have always show a small strip of skin for decorative purposes. Roll a strip of zucchini into a spiral and place in the center of the dish (with the skin of the vegetable up), then surround it with a few strips of carrots and eggplant until reaching the ends of the dish. Drizzle olive oil over all. Season with salt and pepper.
Bake for 40-50 minutes or until the crust is golden and the veggies (particularly the carrots) seem soft to the touch (I used a toothpick to test one of the carrots). Serve hot as a side dish or main course. Can also be served at room temperature.