In a covered Instant Pot (with a glass lid), heat about 1/4 cup of the yellow curry broth on medium to high heat.
Add onions, ginger, turmeric and cumin and saute. Add potatoes and sauté a few minutes.
Crumble tempeh into tiny pieces (resembling ground meat), mix well, then add coconut milk.
Close the Instant Pot and Cook at low pressure for 4 minutes by using the Manual setting, adjusting pressure to low, and setting cook time to 4 minutes.
When time is up, use a quick release.
Remove the lid and, uncovered, simmer until liquid is absorbed. Add salt and pepper (if desired). Enjoy!