Pour the fennel seeds into a dry skillet and place them over medium heat. Toast the fennel seeds until fragrant, about 30 seconds to a minute. Shaking the pan frequently.
1 tbsp fennel seeds
In a large bowl whisk to combine half of the toasted fennel seeds, the flour, sugar, yeast, 1 1/2 teaspoons of the salt, and half of the orange zest. Set the bowl aside.
4 cups all-purpose flour, ¼ cup granulated sugar, 2½ tsp kosher salt, ¾ tsp active dry yeast, 1 navel orange
In the bowl of a stand mixer, whisk to combine the potato, water, and honey. Place the hook attachment on the mixer and add half of the dry ingredients. Mix on medium-low until a loose dough forms. Add the remaining dry ingredients and mix on low until thoroughly integrated.
1 cup warm water, ½ cup mashed potato, 2 tbsp honey
With the mixer running, start adding the butter a couple of cubes at a time. Wait until the butter is fully integrated before adding more.
¼ cup salted butter
Once all the butter is in, knead the dough on a floured surface until smooth and elastic. This should take about 7 minutes. Transfer the dough to a bowl greased with neutral oil. Cover and let rise for an hour and a half or until doubled in size.
Punch the dough down and divide it into 8 equal pieces. Working with one piece at a time, flatten the dough into a rough rectangle. Take the end closest to you and roll it away from yourself as you would a burrito. Pinch to form a seal along the edges and refine the shape. Repeat with the remaining pieces.
Transfer the formed rolls to a baking sheet lined with parchment paper or a silicon mat. Cover and let rise for 30 minutes. This is a good time to start preheating the oven to 350°F.
Once the oven is up, beat the egg with one tablespoon of water. Brush the mixture over the buns. In a small bowl, whisk to combine the remaining salt, fennel seeds, and orange zest. Sprinkle the mixture over the buns and transfer them to the oven. Bake for 25-30 minutes, rotating the pan once halfway through, until golden. Let cool.
1 large egg