Combine everything but flour in a mixer
Add eight (8) cups of flour (mix and combine a bit with each cup)
If dough is not lopsided in bowl or sticks to the sides of bowl add more flour.
Knead eight (8) to ten (10) minutes until dough stretches thin(windowpane)
Place in bowl with lid and let rise until it doubles in size
At this point, divide dough into three (3) equal parts
To form into a bun: cut the dough into a lump and measure it on the kitchen scale. My buns are 115-ish grams to give a uniform look.
Then take the dough and tuck it under until it is smooth on top. See the pictures in the post to see how. I show you HOW to do this with a kitchen scale in this video at 29:30 Place buns on parchment paper with a couple of inches of space between buns and then cover with a wet wrung out towel or oil sprayed plastic wrap over the top and let it do a second rise around 1 hour.
Then take a bowl of water, dip hands into the water and then press down each bun slightly to flatten it out.
Crack one egg into a bowl, whisk and brush on top of the buns.
Bake at 350° for 25 minutes plus. I cut one open to see if done, if not done in center, but getting crispy on top, drape a piece of foil over the top and bake 5-10 minutes longer.
Use a bread knife and gently cut the bun in half for hamburgers