Cook and peel the potatoes in a pot with water (you will need to reserve 150 ML of the water). Once the potatoes are cooled, pass them through a ricer, into a large mixing bowl.
Meanwhile proof the yeast with some of the reserved WARM potato water (about 1/4 cup) and 11/2 tsp sugar. Let stand for 5 minutes until foamy.
Add the flour, and mix until crumbly. Add the yeast mixture, the melted margarine and slowly add the remaining potato water. At this point you can either mix by hand or put it in your Kitchen Aid mixer with the bread hook attachment. Be careful when mixing the water, because the dough consistency must not be too dry or too wet, it should be tacky to the touch and come together into ball. Keep kneading until a smooth ball forms.
Place the dough in a well greased bowl, and cover it with seran wrap or a towel. Place in a warm spot to rise - I usually put it in my oven to avoid drafts. Let is rise for about one hour or until doubled in size.
While the dough is rising assemble the filling. Mix all the ingredients together and set aside.
Grease a 12 inch sping form pan. Se aside.
Preheat oven to 350 degrees.
Once the dough doubles, take it out of the bowl and gently deflate it and divide the dough in half. Place the first half in the mold covering th eentire bottom. Put the filling on top of the dough but leave 1/4 inch border so as the filling does not touch the sides. Place the second half of the dough on top of the filling.
Put the sliced tomatoes on top of the second half of the dough, sprinkle with salt and drizzle with olive oil. Bake for about 40 minutes or until done.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	864.63 Kcal (3620 kJ)
Calories from fat	189.11 Kcal
		% Daily Value*
Total Fat	21.01g	32%
Cholesterol	55.61mg	19%
Sodium	2053.62mg	86%
Potassium	875.38mg	19%
Total Carbs	126.55g	42%
Sugars	3.43g	14%
Dietary Fiber	8.18g	33%
Protein	40.18g	80%
Vitamin C	11.3mg	19%
Vitamin A	0.1mg	5%
Iron	2.7mg	15%
Calcium	610.8mg	61%

Amount Per 100 g
Calories	232.76 Kcal (975 kJ)
Calories from fat	50.91 Kcal
		% Daily Value*
Total Fat	5.66g	32%
Cholesterol	14.97mg	19%
Sodium	552.84mg	86%
Potassium	235.65mg	19%
Total Carbs	34.07g	42%
Sugars	0.92g	14%
Dietary Fiber	2.2g	33%
Protein	10.82g	80%
Vitamin C	3mg	19%
Iron	0.7mg	15%
Calcium	164.4mg	61%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

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