Soft Sourdough Onion Rolls

Name: Soft Sourdough Onion Rolls
Prep time: 45 min
Cook time: 35 min
Total time: 1 h 20 min
Cuisine: American, Israeli
Ingredients: 40 grams ripe (active starter (refreshed 6-12 hours earlier)); 40 grams water (filtered, at room temperature); 120 grams bread flour; 20 grams sugar; 30 grams bread flour; 150 grams water; All of the levain; All of the tangzhong; 43 grams neutral oil (vegetable, sunflower, canola); 3 egg yolks (at room temperature); 80 grams honey; 290 grams bread flour; 8 grams fine sea salt (or table salt); 1 egg (for egg wash; for a deeper colored exterior, use just the yolk); 1 medium onion (peeled and diced); 1 teaspoon poppy seeds; ⅛ teaspoon salt; A pinch of fresh black pepper; 1 Tablespoon olive oil