Make the crust:
- Place grated potatoes in a colander placed over a bowl. Toss the potatoes with ½ teaspoon salt and set aside for 10 minutes. Press out the excess water.
- Combine potatoes, beaten egg and onion in a medium bowl. Pat the potato mixture into the greased pie pan, building up the sides of the crust with lightly floured fingers.
- Bake for 35-40 minutes, until golden brown. Remove crust from the oven, and reduce the temperature to 350°F.
Meanwhile, make the filling:
- Bring a pot of water to a boil. Carefully add cauliflower to the water, and blanch, cooking for about 3 minutes. Remove from heat and drain.
- In a medium bowl, beat together eggs, milk, ½ teaspoon of salt and the pepper. Set aside.
- Melt butter in a large skillet over medium heat. Add cauliflower, onions, garlic, and more salt, to taste. Cook until lightly browned, about 5 minutes. Add parsley and cook an additional 5-10 minutes, until cauliflower is fork tender.
- Remove from heat.
Assemble Quiche:
- Sprinkle half of the Toma over the potato crust. Add the cauliflower mixture, then the remaining cheese. Pour the milk-egg mixture over the top.
- Bake for 35-40 minutes or until set.
- Remove from the oven and serve.