Sourdough Challah

Name: Sourdough Challah
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Ingredients: 30 grams ripe, acive starter (refreshed 6-10 hours earlier); 100 grams water (filtered at room temperature); 80 grams bread flour; All of the levain; 26 grams warm water; 3 egg yolks, at room temperature; 43 grams neutral oil such as sunflower (grapeseed, sunflower, canola, vegetable); 50 grams honey; 283 grams bread flour; 8 grams fine sea salt; 1 egg (for egg wash; for a deeper colored exterior, use just the yolk)