01 - Combine active sourdough starter with warm water in a large bowl. Stir thoroughly until starter is completely dissolved and mixture is uniform.
02 - Add bread flour, granulated sugar, salt, honey, chopped pistachios, and freeze-dried raspberries to the bowl. Mix until a shaggy, rough dough forms and all flour is incorporated.
03 - Turn dough onto lightly floured surface. Knead for 8 to 10 minutes until dough becomes smooth, elastic, and no longer sticky. Perform windowpane test to ensure proper gluten development.
04 - Place dough in lightly oiled bowl. Cover with plastic wrap or damp towel. Ferment at room temperature for 8 to 12 hours overnight until dough has doubled in size and shows visible fermentation bubbles.
05 - Turn dough onto flour-dusted surface. Divide into 8 equal portions. Shape each piece into a smooth ball by tucking edges underneath. Poke thumb through center of each ball and gently stretch to form ring, creating even bagel shape with 2-inch diameter hole.
06 - Place shaped bagels on parchment-lined baking tray. Cover with clean towel. Let rest at room temperature for 45 to 60 minutes until slightly puffed and dough springs back slowly when touched.
07 - Preheat oven to 425°F. In a large pot, bring water, baking soda, and honey to a gentle simmer over medium heat. Maintain temperature below boiling.
08 - Gently drop bagels into simmering water, working in batches of 3 to 4. Poach for 45 seconds per side, flipping once with slotted spoon. Remove and drain briefly before returning to parchment-lined tray.
09 - While bagels are still damp from poaching, sprinkle generously with additional chopped pistachios and freeze-dried raspberry pieces. Press gently to ensure adherence.
10 - Bake for 20 to 22 minutes until bagels develop deep golden-brown crust and sound hollow when tapped on bottom. Rotate tray halfway through baking for even browning.
11 - Transfer bagels to wire rack. Cool completely for at least 30 minutes before slicing or serving to allow crumb structure to set properly.