Natural leaven (Slideshow version)
Stage 1/11 : 5 min.
Day 1:In a small pot, such as a jam jar, mix throughly 20 g flour with 20 g warm water.
You can increase your chances of success by adding the point of a teaspoonful of honey or brown sugar. It should look pasty.
You have just made the "Leaven chef", put the lid on the pot lightly so the air passes, and keep in a warm place.