The following ingredient measurements and cooking time are for a 6-quart size instant pot (electric pressure cooker). If your instant pot size is smaller than 6-quart, please reduce the beef bone and brisket quantity by a 1/8 to 1/4 lb less. Please make sure not to overfill the soup pot. Leave some space to allow liquid to come to a boiling state without spilling over.
The following ingredient measurements and cooking time are for a 6-quart size instant pot (electric pressure cooker). If your instant pot size is smaller than 6-quart, please reduce the beef bone and brisket quantity by a 1/8 to 1/4 lb less. Please make sure not to overfill the soup pot. Leave some space to allow liquid to come to a boiling state without spilling over.
Before pressure cooking begins, submerging the beef bones and brisket in a large stockpot of water and bringing them to a rolling boil for ten minutes is essential for extracting impurities that would otherwise muddy a clear broth. Rinsing those bones and the meat under room temperature tap water immediately after this initial boil washes away coagulated proteins, which guarantees a cleaner, translucent soup base. If skipping this step saves time, expect a cloudier broth with a heavier, more muted flavor profile that masks the delicate spices.
Dry-roasting the onion, ginger, shallots, and spices in a cast iron skillet over medium heat forces the natural sugars to caramelize and release essential oils into the surrounding air. When rotating these aromatics frequently, look for slightly charred outer surfaces rather than blackened spots, because bitter carbon will ruin the underlying sweetness of the broth. Enclosing these charred components alongside the roughly diced leeks inside large tea bags or cheesecloth prevents solid debris from floating freely through the 4-liter liquid mark inside a 6-quart electric pressure cooker.
Natural pressure release allows the collagen within the beef shank soup bones to break down into gelatin without forcing moisture out of the muscle fibers. Removing the cooked brisket and submerging it in cold water for at least ten minutes halts the residual cooking process while preventing the exterior from oxidizing and turning an unappealing dark color. Thinly slicing that rested meat at a 45-degree angle directly against the grain ensures tender bites when hot broth is ladled over fresh bean sprouts, mint leaves, and lime wedges.