Creating Authentic Homemade Chicken Tikka Masala can be straightforward if you follow these simple steps:

1. Prepare the Marinade: In a large bowl, combine yogurt, lemon juice, vegetable oil, cumin, coriander, paprika, turmeric, garam masala, cayenne pepper, garlic, and ginger. Mix well to create a smooth marinade.

2. Marinate the Chicken: Cut the chicken into bite-sized pieces and add to the marinade. Ensure the chicken is well coated. Cover the bowl and refrigerate for at least 1 hour (preferably overnight for maximum flavor).

3. Cook the Chicken: Preheat your grill or oven to medium-high heat. Grill the marinated chicken pieces for about 5-7 minutes per side until cooked through and slightly charred. Alternatively, you can bake them in the oven at 400°F (200°C) for 20-25 minutes.

4. Make the Sauce: In a large skillet, heat a tablespoon of oil over medium heat. Add the crushed tomatoes and sugar. Stir and cook for about 5 minutes.

5. Simmer the Sauce: Lower the heat and pour in the heavy cream. Stir well, letting the sauce simmer and thicken gently for about 10-15 minutes.

6. Combine Chicken and Sauce: Add the cooked chicken pieces to the sauce, stirring until fully coated. Allow to simmer for another 5-10 minutes. Season with salt to taste.

7. Garnish: Remove from heat, garnish with fresh cilantro, and serve hot!

By following these steps, you will successfully create a fantastic Authentic Homemade Chicken Tikka Masala that will delight everyone at your table.