DEEP-DISH SPINACH PIE Makes 8 servings When this square pie is chilled, it is easy to cut into 2-inch squares for appetizers. For a main dish, however, it is best served either hot or at room temperature. Garnish the servings with a dollop of sour cream or plain yogurt and a sprig of fresh basil. Vz recipe Lemon Pastry (page 94) 1 tablespoon Dijon-style mustard 2 pounds fresh spinach, cleaned and stemmed /2 teaspoon dried tarragon 1/4 cup fresh lemon juice 1 cup crumbled feta cheese 4 eggs IVa cups heavy cream or evaporated milk /2 cup sour cream /2 teaspoon salt 1/4 teaspoon freshly grated nutmeg Preheat the oven to 400째F. On a lightly floured surface, roll out the pastry to a 13-inch square and fit into a 9-inch square baking pan. Fold the overhanging pastry all around to make a raised edge and crimp decoratively. Fit a sheet of foil over the dough and fill with pie weights or dried beans.