Press sauté and add oil to the pot. Once the oil is hot, add the cumin and mustard seeds. When the cumin begins to brown, add the potatoes and spices and mix well.
Add the onion masala and water to the pot.
Secure the lid, close the pressure valve and cook for 4 minutes at high pressure.
Quick release pressure.
Add the dried fenugreek leaves to the pot and mix well. The leaves will absorb any remaining liquid in the pot.