When you're ready to reheat the brisket, preheat your oven to 300°F (150°C) or use the Instant Pot on the "Sauté" setting. Add a small splash of beef broth to the meat to keep it from drying ...

The Instant Pot is the fast method, taking just an hour and a half. One great feature of this appliance is its sauté setting, allowing you to brown the brisket as you would in a pot on the stove.

If the pot looks dry, add a bit more oil. Add the onion and sauté until golden, 3 to 5 minutes. Add the garlic and ginger and sauté for 1 minute longer.