Prepare Shio Tare: Soak 50g of rishiri konbu overnight in 500ml of water. Heat slowly to just under boiling, then remove konbu. Add 35g of katsubushi and keep at low heat for 5 minutes. Strain and return dashi to pot. Add 165g of salt, 100ml of sake, 30ml of mirin, 10ml of vinegar, and 30ml of koikuchi shoyu (add shoyu after cooling the mixture to room temperature).
Prepare Soup: Blanch chicken backs for 30 seconds, chicken feet (after preparing) for a similar time, and pork bones for 3 minutes. Rinse bones. Add bones to stock pot with 66g of pork fat, all aromatics, and 4L of water. Bring to a boil, then add 16g of dried shrimp.
Prepare Dashi for Soup: Soak 26g of konbu and 2 dried shiitake mushrooms in 1L of water overnight. Heat to just under boiling, remove konbu (and shiitake if removed early), add 33g of katsuobushi, and let steep.
Combine and Cook Soup: Skim off any scum from the soup. Strain the dashi stock into the soup. Let it simmer at just under 200°F for 4 hours without boiling. Strain the soup to achieve clarity.
Serve: Combine 300ml of soup with 10ml of shio tare. Serve immediately for best taste.