In a large bowl mix starter, liquid, butter (or oil) and sugar or honey.
In a separate bowl, mix flours and fine sea salt.
Add flour mixture to liquid mixture and mix thoroughly. Cover and let rest on the counter for 30 minutes.
Fold over knead 15 times. Let rest 30 minutes
Fold over knead 15 times. Let rest 30 minutes.
Fold over knead 15 times.
Place into a well oiled rising container 2½ times as large as dough and cover .
Let rise on counter 10-12 hours until just doubled. (10 hours on a warm night, over 68 degrees, 12 hours on a cooler night). This will vary so some attention is needed here.
Next day
Gently coax out of rising container onto a lightly floured counter.
Fold corners of dough over themselves 8 times making a ball.
Flip the loaf over onto the seam, cover and let rest 15 minutes.
Oil 9”x 5” bread pan.
Shape dough into a log and place seam side down in oiled pan.
Cover and let rise until highest point of the dome dough is 1-inch above edge of the pan. 2-3 hours.
Preheateat oven to 375°F/190°C.
Spritz top of loaf with water, score the top of the loaf (if desired) and place into hot oven.
Turn the oven down to 350°F/177°C.
Bake 35-40 minutes until interior of loaf reaches 195°F/91°C.
Remove loaf from oven and brush rust with melted butter. (optional)
Let cool 2 hours before slicing.