01 - Whisk the sourdough starter with warm water in a large bowl until completely dissolved and homogeneous.
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 the dough onto a lightly floured surface and knead vigorously for 8 to 10 minutes until smooth, elastic, and fully developed.
04 - Place the kneaded dough in a lightly oiled bowl, cover with plastic wrap or a damp towel, and ferment at room temperature for 8 to 12 hours or overnight until doubled in volume.
05 - Turn the fermented dough onto a flour-dusted surface, divide into 8 equal portions, and roll each into a smooth ball. Poke a hole through the center of each ball and gently stretch to form a uniform ring shape.
06 - Arrange shaped bagels on a parchment-lined baking sheet, cover loosely, and let rest for 45 to 60 minutes until slightly puffed and expanded.
07 - Preheat oven to 425°F. Bring the poaching liquid (water, baking soda, and honey) to a gentle simmer in a large, wide pot.
08 - Carefully drop bagels into the simmering water in batches, cooking for 45 seconds per side. Remove with a slotted spoon, drain briefly, and return to the parchment-lined tray.
09 - Immediately sprinkle the poached bagels with chopped pistachios and freeze-dried raspberry pieces while the surface is still tacky.
10 - Bake for 20 to 22 minutes until deeply golden brown and shiny. Cool completely on wire racks before slicing or serving.