Mix the bread flour and salt in a large bowl.
In a separate bowl, combine the sourdough starter, water, and sugar.
Pour the wet ingredients into the dry ingredients and mix until a dough forms.
Knead the dough on a floured surface for about 10 minutes until smooth.
Place the dough in a greased bowl, cover, and let it rise for 2 hours or until doubled.
Punch down the dough and divide it into 8 equal pieces.
Shape each piece into a ball, then poke a hole in the center to form a bagel.
Let the bagels rest for 30 minutes, covered with a cloth.
Preheat your oven to 220°C (425°F) and bring a large pot of water to a boil.
Boil each bagel for 1-2 minutes on each side, then place on a baking sheet.
Bake for 20-25 minutes until golden brown. Enjoy!