Preheat the oven to 170 ° C. Lightly oil a flat baking sheet and sprinkle some flour over it.
Sift the flour and baking soda into a mixing bowl, add salt and chopped tomatoes and mix.
Make a well in the middle of the flour and pour in the buttermilk. Mix with a spoon to form a soft batter. On a floured surface to a square of about 23 cm. Roll out the dia.
Spread the pesto on top and sprinkle the parmesan on top. Then roll up like a Swiss roll and carefully place on the baking sheet. Sprinkle a little with flour.
Bake for 35-40 minutes, until the bread sounds hollow when you tap the underside.