Sourdough Cornbread with jalapeno and fresh corn

Name: Sourdough Cornbread with jalapeno and fresh corn
Prep time: 30 min
Cook time: 25 min
Total time: 55 min
Cuisine: American
Ingredients: 1 cup (8 oz, 224g) active sourdough starter (100% hydration); 1 cup (8 oz, 240 ml) warm water; 1 teaspoon salt; 1 tablespoon honey; 2 1/2 cups (12.5 oz, 350g) all purpose flour; 1 cup (4 oz, 112g) cornmeal; 2 tablespoons grated or pureed onion (about 1 small onion); 2 Jalapeno peppers, ribs and seeds removed, minced; 4 oz (112g) cheddar cheese, grated; 1 cup fresh or frozen corn kernels; 1 teaspoon toasted cumin seeds (plus extra for topping); 1 egg whisked with 1 tablespoon of water for egg wash