01 - Whisk sourdough starter and warm water in a large bowl until completely dissolved and smooth.
02 - Add bread flour, sugar, salt, honey, pistachios, and freeze-dried raspberries to the starter mixture. Stir until a shaggy, rough dough forms.
03 - Turn dough onto a lightly floured surface and knead vigorously for 8 to 10 minutes until smooth, elastic, and fully developed.
04 - Place dough in a lightly oiled bowl, cover tightly, and ferment at room temperature for 8 to 12 hours or overnight until doubled in bulk.
05 - Divide dough into 8 equal pieces on a flour-dusted surface. Form each piece into a smooth ball, then poke a hole through the center and gently stretch to create the bagel ring.
06 - Arrange shaped bagels on a parchment-lined baking sheet, cover loosely, and rest for 45 to 60 minutes until slightly puffed.
07 - Preheat oven to 425°F and bring the poaching liquid to a gentle simmer in a large pot.
08 - Drop bagels into simmering water in batches. Poach for 45 seconds on each side, then remove with a slotted spoon and return to the baking sheet.
09 - Sprinkle bagels immediately with additional chopped pistachios and freeze-dried raspberry pieces while still wet from poaching.
10 - Bake for 20 to 22 minutes until deeply golden brown. Transfer to a wire rack and cool completely before slicing.