close up of sourdough starter levain leaven with thick texture and bubbles in glass jar with a lid. homemade artisan bread baking

sourdough starter levain thick texture bubbles glass jar homemade artisan bread baking fermentation closeup close natural yeast process organic gluten dough breadmaking culinary kitchen food preparation ingredients culture bubbly artisanal healthy wheat traditional leaven ratio ferment rye crust diet active feeding feed