Place the cashews into a large blender jar with the peeled and quartered onion, the tomato, ginger + garlic, and the spices. all ingredients into the jar.
Blend everything to a smooth paste. If the blender is struggling, add 2-3 Tablespoons of water to help get going.
Use the tikka masala sauce to prepare a tofu tikka masala or another tikka masala dish. You can also freeze it (please see post for instructions).
Video
Notes
Use fresh Ginger and Garlic (1 Tbs if chopped fine) with a ratio of 1:2 or use ready-made Ginger and garlic paste
The Cashews can be substitutes with peeled almonds. However, that completely changes the taste and velvety consistency.
Use a powerful blender such as a Vitamix for the smoothes result.
The recipe is without artificial red food coloring. If you want your tikka masala red (just like the store bought stuff), add red food coloring.