1. In a large mixing bowl, combine the rye flour, sourdough starter, and water. Mix until well combined.
2. Cover the bowl with a damp cloth and let it rest at room temperature for 12-24 hours.
3. After the fermentation period, add the salt and mix thoroughly.
4. Shape the dough into a round loaf and place it in a floured proofing basket. Let it rise for 2-3 hours.
5. Preheat your oven to 220°C (430°F) with a Dutch oven inside.
6. Carefully transfer the dough into the preheated Dutch oven. Bake for 30 minutes with the lid on, then remove the lid and bake for another 10 minutes.
7. Let the bread cool completely on a wire rack before slicing.