Place the 100g of flour, oil, water, and honey in a bowl.
Mix well and knead, adding a little more flour as needed to keep the dough from sticking to your fingers. Let rest at least 2 days near a radiator.
Add the remaining 50g of flour and knead again; let rest another 2 days. Your starter is ready to use.
Homemade Yeast
Make a thin batter of flour and lukewarm water.
Let it stand in a warm place until it ferments and is full of bubbles. 2 cups of this liquid yeast is equal to 1 cup of old yeast.
Yeast is good when it is foamy and full of beads, has a brisk pungent odor and has a snap and vim1. It is bad when it has an acid odor, is watery and has a tin film on top.
Recipe Notes
vim: lively or energetic spirit; enthusiasm; vitality.