Sourdough Starter Discard Cinnamon Raisin Bread

• 6 oz water
• 1 oz sugar
• 1 packet/envelope active dry yeast
  atau 2 ¼ tsp active dry yeast
• 16 oz all-purpose flour
• 4 ½ oz sourdough starter discard (unfed)
• 1 large egg
• 2 ½ oz unsalted butter, diced, room temperature, plus extra to grease
• ½ tsp salt, to taste

Filling

• 3 oz sugar
• 2 tsp all-purpose flour, plus extra to dust
• 1 tbsp ground cinnamon
• 1 large egg, whisked
• 4 oz raisins
• unsalted butter, melted, to brush (opsional)
• confectioners sugar, to sprinkle (opsional)