In a large bowl, add active starter, warm water, and brown sugar. Mix by hand (or use a Danish Dough Whisk, one of my favorite sourdough tools!) until it it looks like a tan, milky liquid.
150g (2/3c) active starter, 250g (1 c) warm water, 40g (4 T) light or dark brown sugar
Next, add the bread flour and salt to the dough. Mix until fully incorporated.
500g (3 1/2 c) bread flour, 9g (1 1/2 tsp) salt
Next is a small labor of love, but trust me when I say, it is all worth it. Knead the dough for 5-6 minutes. I’ve tried using a stand mixer, but my bagels never taste as soft and chewy as when I do it by hand. So it is still my preferred method.
Pull a small section of bagel dough above the rest, fold it over on top, and push into the dough with the heel of your hand. Repeat this motion while turning the bowl of dough clockwise for 5-6 minutes.
As you knead, you will notice the dough will become pretty stiff and a little bumpy looking – this will be a stiff dough, so totally normal.
Cover the dough and let it it rest for 60 minutes.
In the meantime, prepare the raisins. This isn’t 100% necessary, but I prefer plump and juicy raisins in my bagels. To do so, add the raisins to a small bowl and pour boiling water on top until fully covered. Allow them to soak while the dough rests.
140g (1 c) raisins