Instant Pot Eggplant Gosthu

I adapted this recipe slightly from a FB group recipe. The adults in the family loved it!  Kids don't like eggplant and wouldn't eat it.

1 medium or large eggplant, diced
1/2 c.  frozen pearl onions
1-2 tomatoes, diced
1/4c. moong dal
2 tsp sambar powder (used store bought)
2 Tb. tamarind concentrate

In a few Tbsp oil, splutter mustard seeds and add curry leaves. Add pearl onions and saute for a few mins.  Toss in eggplant and tomatoes.  Add moong dal, sambar powder, tamarind, salt and enough water to cover the vegetables.  Cook on manual high pressure for 12 mins.  NPR or 10 mins then QR. Mash it up a little, and serve with pongal.