This is the signature mustard green dish from the Punjab region of India that you don't see that often on restaurant menus. Its a rustic hearty dish of green thats paired with an equally rustic bread made out of corn meal. The flavor develops the longer it simmers, and the reward for your patience is well worth it in terms of the flavors —Panfusine
Trim the veins off the mustard greens and shred them with your hands into pieces. COmbine with the spinach leaves and cook down until they're completely wilted, and then a bit more. Allow to cool and then puree the leaves using an immersion blender.
Crush the ginger, garlic and the serrano chiles in a mortar & pestle and make it as smooth as possible ( Yes, you can run it thru a blender if you choose too).
Heat 2 tablespoons of the butter and add the ginger garlic paste, Fry until the paste begins to turn brown. Add the shallots and fry until it turns translucent and then add the dried fenugreek leaves. Allow the leaves to bloom until they emit their signature aroma.
Add the mustard/spinach puree along with the paprika and salt. Allow the mix to simmer until the liquid evaporates enough for the dish to almost acquire a paste like consistency. Add the remaining butter, simmer for 5 minutes more
Drizzle the cream just prior to serving. Serve warm with Naan or Pita