In a large bowl combine the dry ingredients: flour, salt, yeast
Pour the warm water into the dry ingredients and stir to incorporate with a wooden spoon, danish whisk or your hands. Don't over work - just pull the dry ingredients and water together - dough will be shaggy, shape into a ball.
Cover the bowl tightly with plastic wrap and set on the counter for it to rise. Allow to rise 12-18 hours at room temperature.
After the dough has risen, pre-heat the oven to 450° and go ahead and place your empty dutch oven with the lid on it in the oven while it is pre-heating.
Turn the dough out onto a lightly floured piece of parchment paper and shape into a ball or an oval - depending on the shape of your dutch oven - my dutch oven is an oval so I shape my dough that way - cover with a cloth and allow dough to rest until oven has come up to temperature and your dutch oven is hot.
Carefully remove the pot from the oven and place the dough and parchment paper into the hot pot and place back in the oven with the lid on.
Bake for 30 minutes with the lid on then remove lid and bake for another 15 minutes.
Remove from the oven and remove the bread from the pot - immediately and carefully rub the loaf with the butter, all of the butter!!
Nutrition values are estimates, for exact values consult a nutritionist.