Main Marinade:

• 1 ½ pounds boneless, skinless chicken thighs, cut into bite-sized pieces
• 1 cup plain yogurt
• 1 tablespoon lemon juice
• 1 tablespoon ginger paste
• 1 tablespoon garlic paste
• 1 ½ teaspoons ground cumin
• 1 teaspoon ground coriander
• 1 teaspoon garam masala
• 1 teaspoon turmeric
• 1 teaspoon chili powder
• Salt to taste

For the Sauce:

• 2 tablespoons butter
• 1 tablespoon oil
• 1 small onion, finely chopped
• 1 tablespoon garlic paste
• 1 tablespoon ginger paste
• 1 teaspoon ground cumin
• 1 teaspoon ground coriander
• 1 teaspoon paprika
• 1/2 teaspoon chili powder
• 1 teaspoon garam masala
• 1 (14.5-ounce) can crushed tomatoes
• 1 tablespoon tomato paste
• 1 teaspoon sugar (optional)
• 1 cup heavy cream
• 2 tablespoons butter (for finishing)
• Chopped cilantro for garnish