Lamb Tikka Masala

Ingredients

• 1 cup/240 mL grass-fed organic plain yogurt or kefir
• 1 tablespoon finely grated fresh ginger
• 2 garlic cloves, minced
• 11/2 teaspoons ground coriander
• 11/2 teaspoons ground cumin
• 1 teaspoon fine sea salt
• 1/2 teaspoon freshly ground black pepper
• 1/4 teaspoon ground cardamom
• 1/2 teaspoon ground turmeric
• 1/8 teaspoon cayenne pepper
• 11/2 pounds/680 g grass-fed lamb stew meat or boneless leg of lamb, cut into 11/2-inch/4 cm pieces
• 2 tablespoons organic neutral-flavored oil, such as grape seed, plus more as needed
• 1 large yellow onion, cut into 1/4-inch/0.65 cm dice
• 1 teaspoon finely grated fresh ginger
• 41/2 teaspoons garam masala (see note)
• 11/2 teaspoons chili powder
• 1/2 teaspoon cayenne pepper
• 11/2 pounds/680 g tomatoes, peeled (optional), seeded, and cut into 1/4-inch/0.65 cm dice
• Fine sea salt to taste
• 2/3 cup/160 mL grass-fed organic plain yogurt or kefir, at room temperature
• Cilantro sprigs, for garnish