1Mix self-rising flour and kefir in a bowl until a soft dough forms. Add salt if desired.
2Place the dough in a bowl, cover with a damp tea towel, and let it rest for 2 hours.
3Flour your work surface. Stretch and fold the dough 4–5 times to develop structure.
4Preheat a Dutch oven at 200°C (400°F) for 30 minutes before baking.
5Transfer the dough to a baking sheet and place it in the preheated Dutch oven. Bake for 50 minutes, removing the lid after 35 minutes to brown the crust.