1In large bowl, mix 1 1/2 cups of the all-purpose flour, the sugar, salt, 1 1/2 teaspoons poppy seed, 1 1/2 teaspoons sesame seed, 1 teaspoon fennel seed and the yeast. In 1-quart saucepan, heat water and butter over medium heat, stirring frequently, until very warm (120°F to 130°F); stir into flour mixture until blended. Stir in remaining all-purpose flour and enough of the whole wheat flour to make dough easy to handle.
2Place dough on lightly floured surface; gently roll in flour to coat. Knead about 8 minutes or until smooth and springy. Grease large bowl with shortening or cooking spray. Place dough in bowl, turning dough to grease all sides. Cover; let rise in warm place about 1 hour or until dough has doubled in size. (If using fast-acting yeast, do not let rise 1 hour; cover and let rest on floured surface 10 minutes.)
3Grease large cookie sheet with shortening or cooking spray. Roll dough into rope, about 20 inches long. Place on cookie sheet. Curl each end of rope in the opposite direction to form a coiled "S" shape. Cover; let rise in warm place 30 to 40 minutes or until almost double.
4Heat oven to 375°F. Brush egg white over dough; sprinkle with 1 teaspoon each poppy seed, sesame seed and fennel seed. Bake 20 to 25 minutes or until loaf is golden brown and sounds hollow when tapped. Remove from cookie sheet to cooling rack; cool.