Rich and Creamy Butter Chicken (Restaurant-Style at Home)

Ingredients

• 1 1/2 lb (680 g) boneless skinless chicken thighs, cut into 1 1/2-inch pieces
• 1/2 cup (120 g) plain Greek yogurt
• 1 tablespoon lemon juice
• 1 tablespoon grated fresh ginger
• 3 cloves garlic, grated or minced
• 1 teaspoon garam masala
• 1 teaspoon Kashmiri chili powder or sweet paprika
• 1/2 teaspoon ground cumin
• 1/2 teaspoon kosher salt
• 1 tablespoon neutral oil, for searing
• 3 tablespoons unsalted butter, divided
• 1 small yellow onion, finely chopped
• 3 cloves garlic, minced
• 1 teaspoon ground coriander
• 1/2 teaspoon Kashmiri chili powder or paprika
• 1 1/2 cups (360 ml) tomato puree or passata
• 1/3 cup (45 g) raw cashews, soaked in hot water for 10 minutes and drained
• 3/4 cup (180 ml) water, plus more as needed
• 1/2 cup (120 ml) heavy cream
• 1 teaspoon dried fenugreek leaves, crushed
• 1/2 teaspoon kosher salt, plus more to taste
• 1/2 teaspoon sugar, optional
• 2 tablespoons chopped cilantro, for serving