In a big mixing bowl, stir together the flour, yeast, and salt.
Pour in the lukewarm water and mix with a wooden spoon until it looks shaggy and messy. That’s perfect.
Cover the bowl with plastic wrap and let it sit on your counter for 2–3 hours, or up to 12 hours if life happens.
When you’re ready to bake, sprinkle flour on a clean surface and gently tip the dough out. Don’t punch it down.
Shape it into a round-ish blob (rustic is good), then let it rest while the oven preheats.
Place a heavy pot with a lid (like a Dutch oven) in the oven and preheat to 450°F (230°C) for 30 minutes.
Carefully place the dough into the hot pot. Cover with the lid and bake for 30 minutes.
Remove the lid and bake for another 10–15 minutes to crisp up that golden crust.
Take it out, listen to the crackle, and try—just try—not to slice it before it cools a bit.