Prepare a yeast dough from the first 4 ingredients and leave to rise overnight in the refrigerator - ideally put in a plastic bowl with a lid.
The next morning, knead the dough again and let it rise again at room temperature. Then divide into 3 portions and form sticks out of each. Score the bars with a knife. Mix the egg white with 6 tablespoons of water and brush the sticks with it. Place on a baking sheet with parchment paper.
Preheat the oven to 225 ° C and place the baguettes in the preheated oven. At the same time pour 1/8 liter of hot water onto the bottom of the oven. Do not open the oven door any more. Bake on the 2nd rail from the bottom for approx. 15-20 minutes.
The baguettes are not as big as the ones you bought, but very tasty!