In a food processor (or by hand) process the ginger, garlic, cilantro, and jalapeño until finely chopped but not pureed. Add salt, garam masala, and turmeric; pulse once or twice just to blend.
Place ginger spice mixture in a large bowl with the ground lamb, egg, and cream, using hands, blending just to combine. If mixture is too crumbly, add up to another 1 tablespoons cream.
Form 6 patties and place on a parchment lined pan or plate. If not using right away, cover with plastic wrap and chill in refrigerator until ready to grill. Let sit out of refrigerator about 20 minutes before grilling.
Heat grill or grill pan to medium high. Carefully grease grill grates with an oil-soaked paper towel. Cook lamb patties 4 to 5 minutes each side.
Serve with naan, lettuce, and Tomato Chutney Yogurt Sauce.