Place a deep skillet or wide saucepan over medium heat. Add the minced up onions, ginger, garlic, and jalapeno. Be sure to not put your face in the steam as this combination is guaranteed to sting your eyes.
Toss everything in the pan periodically for a couple of minutes until the ingredients start to stick, then drizzle in the oil. Continue to saute for another 10 minutes or more until the onions appear tender, but not golden. Reduce the heat if necessary to avoid darkening the onions.
Now sprinkle in the spices: coriander, ground cumin, chili powder, turmeric and salt. Saute for another 5 minutes. Add the chopped dark leafy greens. If there are more greens than fit in the pan, let them cook down briefly and then add more as they are able to fit. Add a splash of water if the greens are sticking.
Once the greens are completely cooked down, transfer to a blender and pulse into a chunky sauce. Taste. Add more of any of the spices or salt as desired. Transfer the sauce back to the saute pan over medium heat, stir in the cream or coconut milk.
If adding a protein, sear the chunks and then fold into this sauce. Serve over rice, with naan or however you most enjoy it. Garnish with tomatoes as we did in the photo above.