Slavski Kolac: Serbian Slava Bread

Name: Slavski Kolac: Serbian Slava Bread
Prep time: 30 min
Cook time: 1 h
Total time: 1 h 30 min
Cuisine: Eastern European
Ingredients: 1/2 cup warm water; 3 tablespoon flour; 2 packages dry active yeast; 1 teaspoon sugar; 1 1/2 cups warm water; 1 teaspoon salt; 1 cup butter, softened; 3 large eggs, slightly beaten; 1 medium lemon, juiced and zested; 4 tablespoon sugar; 6 to 7 cups bread flour, or all-purpose ; divided; 1 large egg; 1 tablespoon water