Combine the flour, salt, sugar, olive oil and water. Add the fresh yeast dissolved in water. Mix well. Knead the dough 10 minutes and add the sultanas in the last minute. The dough should be slightly soft. Place the dough in a lightly oiled tray large enough for it to double in size. Cover it with a cloth and leave it to ferment for one hour.Bake it in a preheated oven at 200 C º for about 35-40 minutes.