Pour the flour into a bowl and form a hollow in the middle with the spoon. Add the yeast, brown sugar and water and mix carefully in the well. Let rise for about 15 minutes. Now add olive oil, sugar, salt and knead into a smooth dough, let it rise for 45 minutes.
Preheat the oven to 240 ° C top / bottom heat.
Knead the dough again briefly, roll out thinly and place on the baking sheet.
Finely dice the onion and garlic, mix with the sour cream, salt and pepper. Pour the mixture on the dough. Scatter cubes of bacon on top.
Place the tarte flambée in the oven on the lowest rack and bake for about 12 to 14 minutes until crispy.