Ultimate Zucchini Bread

Name: Ultimate Zucchini Bread
Ingredients: 1 1/2 pounds (680 grams) zucchini , shredded; 1 1/4 cups packed (8 3/4 ounces/248 grams) brown sugar; 1/4 cup vegetable oil; 2 large eggs; 1 teaspoon vanilla extract; 1 1/2 cups (7 1/2 ounces/213 grams) all-purpose flour; 1/2 cup (2 3/4 ounces/78 grams) whole-wheat flour; 1 tablespoon ground cinnamon; 1 1/2 teaspoons salt; 1 teaspoon baking powder; 1 teaspoon baking soda; 1/2 teaspoon ground nutmeg; 3/4 cup walnuts , toasted and chopped (optional); 1 tablespoon granulated sugar