Make the dough: Put flour in a large mixing bowl. Stir together 1 cup water, 1 teaspoon salt and 4 tablespoons oil, then pour over flour and mix until dough comes together in a rough ball.
Turn out onto a floured board and knead until smooth, 2 to 3 minutes, adding more flour if dough is sticky. Wrap and set aside at room temperature for 30 minutes. (May refrigerate overnight and bring to room temperature.)
Make the filling
Heat 2 tablespoons oil in a large skillet or wide pot over medium heat. Add onions and a little salt and cook, stirring, until softened, about 5 minutes. Add greens, season generously with salt and pepper, and mix well.
Coarsely chop greens, add to mixture and cook until just beginning to wilt. Turn off heat.
Add nutmeg, ricotta and half the Parmesan and mix. Taste and adjust; it should be highly seasoned. Beat 4 of the eggs. Set aside 3 tablespoons beaten egg; add remaining beaten egg to greens and mix well. Let cool.
Heat oven to 375 degrees. Cut dough into 4 pieces and form into balls. Roll out each ball into a very thin 12-inch circle. Place 1 dough circle on a 12-inch pizza pan lined with parchment. Brush lightly with oil, then lay another dough circle on top.
Spoon greens evenly over dough to a 2-inch thickness, leaving a 1-inch border of dough. Smooth the surface. With a soup spoon, make 5 indentations in greens and crack a raw egg into each depression. Sprinkle with remaining Parmesan.
Cover with another dough circle and paint lightly with oil. Place last dough circle on top. Using a paring knife, trim any excess dough at perimeter of pie. Fold outer edges together and crimp to seal pie. Paint top with reserved beaten egg. Using a paring knife, make 2 or 3 steam vents.
Bake for about 45 minutes, until very well browned. Slide torta onto a cutting board and let cool slightly before slicing. May also be served at room temperature.
To make the dressing, whisk together the Dijon, maple and vinegar. Drizzle in the olive oil, whisking to combine. Season to taste with sea salt and pepper. Set aside.
To make the millet, place the millet in a small saucepan on low and allow to dry toast for a few minutes. Add the water and bring to a boil, then lower heat to a simmer. Cover and allow to cook, simmering for 15 minutes. Take off the burner and let sit, covered, for 5 minutes. Toss the cooked millet with some of the dressing and set aside. This can be done up to a day in advance. The longer the millet marinates in the dressing, the better. Store in the refrigerator and allow to come to room temperature before serving.
Toss the squash, grapes and shallot in a large bowl with olive oil, sea salt and pepper. Spread onto a foil-lined half sheet pan and roast in the oven for 20 minutes until the squash is fork tender.
To assemble, plate some of the squash rings on a platter or plate, layering with the millet, greens and grapes. Drizzle any pan drippings and spoon a little more dressing on top. Garnish with walnuts and sea salt. Serve at room temperature.
