01 - Combine active sourdough starter with warm water in a large bowl. Stir thoroughly until the starter is completely dissolved and the mixture is homogeneous.
02 - Add bread flour, granulated sugar, salt, honey, chopped pistachios, and freeze-dried raspberries to the sourdough mixture. Mix until a shaggy, rough dough forms and all dry ingredients are incorporated.
03 - Turn the dough onto a lightly floured surface and knead for 8 to 10 minutes. Work until the dough becomes smooth, elastic, and holds its shape when stretched.
04 - Place the kneaded dough in a lightly oiled bowl. Cover and let ferment at room temperature for 8 to 12 hours, preferably overnight, until the dough has doubled in size.
05 - Transfer the fermented dough onto a surface dusted with flour. Divide into 8 equal portions. Roll each portion into a smooth ball.
06 - Poke a hole through the center of each dough ball using your finger. Gently stretch and rotate to create an even ring shape. Arrange on a parchment-lined baking sheet, cover, and rest for 45 to 60 minutes until slightly puffed.
07 - Preheat oven to 425°F. In a large pot, bring 8 cups of water, baking soda, and honey to a gentle simmer.
08 - Carefully drop bagels into the simmering liquid, working in batches. Poach for 45 seconds on each side. Remove with a slotted spoon and return to the prepared baking sheet.
09 - Immediately sprinkle the poached bagels with chopped pistachios and freeze-dried raspberry pieces while they are still tacky from the poaching liquid.
10 - Transfer the baking sheet to the preheated oven. Bake for 20 to 22 minutes until the bagels develop a deep golden-brown color. Cool completely on wire racks before slicing or serving.