Blanch the tomatoes in salted, boiling water for 30
seconds. Drain and peel. Squeeze out as many seeds
as possible and chop finely.
Transfer to a large
bowl with the herbs and garlic. Season with salt and
pepper and drizzle with oil. Let marinate for 2
hours.
Dissolve the yeast with the sugar in 4
tablespoons of water and set aside for 15 minutes,
until foamy.
Cook the potatoes in a large pot of
salted, boiling water for about 20 minutes, or
until tender. Drain and mash.
Sift the flour and
1 teaspoon of salt into a medium bowl. Knead in the
mashed potatoes, yeast mixture, and butter to make a
stiff dough. If the dough is too soft, add more
flour.
Knead for about 10 minutes on a floured work
surface. Cover and let rise for 30 minutes. Shape
into small balls and roll out into 4-inch (10-cm)
rounds.
Heat the oil in a large frying pan until
very hot and fry the fritters in small batches until
golden and puffy.
Remove with a slotted spoon and
drain well on paper towels. Top with the marinated
tomatoes and Mozzarella. Serve immediately.