Mix together the dry ingredients: sifted flour, salt and baking powder.
In a separate container, mix the vinegar, baking soda, sugar and 2-3 tbsp water.
Make a well in the flour, pour the oil and water in it.
Knead a soft dough, then leave it to sit for at least 10 min.
Bake in a floured and oiled tray in a moderate oven.