Instructions: Place the yeast in a large bowl and add E cup of warm water (105-115) and stir to combine; set aside 3 to 5 minutes. Add 1/3 cup of the flour and stir until smooth, then add the margarine, 1/2 teaspoon of salt and the remaining flour, and stir until the mixture forms a cohesive dough. Transfer the dough to a lightly floured board and knead 5 to 10 minutes, or until the dough is smooth and elastic. Place the dough in a medium-size bowl, cover it with a damp kitchen towel and set it aside in a warm place to rise 1 hour, or until the dough is doubled in bulk.

Meanwhile, wash the potatoes, place them in a small saucepan with cold water to cover and bring to a boil over medium-high heat. Reduce the heat to medium and simmer, uncovered, 10 to 15 minutes, or until the potatoes are just tender when pierced with a sharp knife. Drain the potatoes and set them aside to cool.

When the dough has risen, punch it down and divide it into 4 equal pieces. Wrap each piece in plastic wrap and refrigerate until needed. Peel the onion, then cut the tomatoes, onion and potatoes into 1/4-inch-thick slices; cover them loosely with plastic wrap and set aside.

Preheat the oven to 500.

Dust a work surface and a rolling pin with cornmeal. Roll each portion of dough into a ball, flatten it into a disk, then roll it out to a 7-inch circle about 1/8 inch thick. Place the circles of dough on a nonstick baking sheet. Top each pizza crust with onions, then with potato and tomato slices. Drizzle the oil over the pizzas, then sprinkle each one with Parmesan, oregano, pepper and a pinch of salt.

Bake the pizzas 10 minutes, then reduce the oven temperature to 400 and bake 5 to 7 minutes more, or until the crusts are golden. Sprinkle the pizzas with parsley and serve.

NOTES : When not laden with fatty sausage, a heavy layer of high-fat cheese and lots of oil, pizza makes an ideal dinner. This vegetable-topped, cheese-dusted pie is a good source of niacin and potassium, and it also supplies more than 5 grams of dietary fiberabout one-fourth of the recommended daily amount.

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