1. Place onion, ginger, and garlic in a food processor; pulse until finely chopped. Add mint, cilantro, garam masala, salt, and pepper; pulse until finely chopped, scraping sides as needed. Add egg and lamb; process until fully combined, scraping down sides as needed.

2. Shape mixture into 1-inch balls; flatten into patties. Heat a saute pan over medium-high heat; add oil. When hot, add patties in batches; cook until cooked through, about 2 minutes per side. Transfer to a paper towel-lined baking sheet to drain.

3. Insert a toothpick or skewer into each patty; place on a platter. Serve with raita, and garnish with fresh mint sprigs.