Activate the Yeast: In a small bowl, combine warm water, sugar, and yeast. Stir gently, then let the mixture sit for 5 minutes until foamy and activated.
Combine Wet Ingredients: In a large mixing bowl, add the sourdough discard and the activated yeast mixture. Stir until well combined.
Add Dry Ingredients: Gradually add the bread flour and salt to the bowl, stirring until a shaggy dough forms. If the dough feels too dry, add a small splash of water, one tablespoon at a time, until all the flour is incorporated.
Knead the Dough: Turn the dough onto a lightly floured surface and knead it with your hands for 6-8 minutes, until smooth and elastic. Alternatively, use a stand mixer with a dough hook for about 5 minutes.
First Proof: Place the dough back into the mixing bowl, cover it with a lid or plastic wrap, and let it proof in a warm spot for 2 hours, or until it doubles in size.
Preheat the Oven and Prepare Dough: Preheat your oven to 425°F (220°C) and place your Dutch oven (with the lid) inside to heat up. Meanwhile, transfer the dough onto a piece of parchment paper. Use your hands to gently shape it into a round loaf. Cover the dough with a tea towel and let it rise for 1 hour (second proof).
Score the Dough: After the second proof, use a sharp knife or a bread lame to score the top of the dough with a simple design or an “X” to allow for expansion during baking.
Bake the Bread: Carefully remove the preheated Dutch oven from the oven and place the parchment paper with the dough inside. Cover with the lid and bake for 25 minutes. Then, remove the lid and bake for an additional 25-30 minutes, or until the crust is deep golden brown.
Cool and Serve: Remove the bread from the Dutch oven and let it cool completely on a wire rack before slicing. This step is crucial to allow the crumb to set properly.