Heat the oil in a large stock pot over medium-high until the oil sizzles dramatically when splashed lightly with water.
Add the onions and ginger to the pot and cook them on the first side until it they're well charred ~45 seconds. Then flip the pieces and cook them long enough to char that side as well.
Pour water and broth into the pot carefully, to avoid steam burns.
Add your meat scraps into the pot, straight from the freezer.
Mix in the the rest of the ingredients, except for the salt.
Bring the broth to just below a boil, then reduce your heat to the lowest setting and cover the pot most of the way. It will take a little while for your broth to heat up, remember that you just contributed a lot of meatcicles to it.
Give the broth a quick skim to remove some of the fat that has risen to the top.
Cook the broth for 1 ½ hours, skimming another 2-3 times during that time.
Mix 1 ½ teaspoon of coarse salt into the broth, then replace the cover and cook for another 15 minutes.
Pour soup through a fine mesh sieve (or less fine but with cheesecloth) into a vessel large enough to contain that much hot liquid. Mix in the last ½ teaspoon of coarse salt.
When it's no longer burning hot, paw through the leavings in your sieve and pull out your slow braised, shredded meat. The fat will have mostly melted from the protein and you'll be left with extremely tender meat.