Fry the cumin, mustard seeds, fenugreek seeds in some oil in a medium-sized cooking pot over high heat. I add the seeds while the oil is cold and turn down the heat when I can hear them sizzling.
Chop the taproot finely and add to the seeds.
Slice the onion thinly and add to the pot. Keep stirring to keep things from burning.
Add one and a half tablespoons of chaat masala spice mixture and keep stirring, allow the spices to become warm and fragrant. Smash black garlic and stir in to allow the garlic to disperse.
Add apple cider and apple cider vinegar to make a broth, and the lentils to soak up the broth.
Add the roasted vegetables and allow to warm through, if the vegetables were roasted previously and stored in fridge.
Taste for spice level and add more chaat masala to taste - I like a lot so I added more.
Garnish with a fresh herb! I used sorrel but cilantro or parsley would also be lovely here.