In a large pot add oil and heat.
Add cumin seed and a pinch of black peppercorn. Let sputter then add the diced yellow onion.
Let onions get golden brown and then add diced ginger and diced serranos.
Sauté for a few minutes.
Add ginger-garlic paste. Sauté until the raw smell is gone.
Add coriander powder, turmeric, cumin powder, red chili powder.
Add a handful of chopped cilantro.
Sauté spices for 1 minute then ground lamb and mix well with the ingredients in the pan making sure nothing sticks to the bottom and then brown the lamb over medium-high heat until fully cooked.
Add yogurt and continue cooking for 20 minutes then add crushed tomato, sugar, vinegar, and garam masala.
Check for salt and let cook for 10 minutes.
Griddle Pav (Indian bread) on both sides with butter.
Pile kheema high on the bottom bun, drizzle with sweet yogurt, tamarind and green chutney, garnish with chopped cilantro & diced red onions. Top with the other half of the Pav.
