Heat the rapeseed oil in a large pan over medium heat.
Add the garlic and ginger paste and fry for 1-2 minutes until fragrant.
Stir in turmeric and ground cumin, cooking for another 30 seconds.
Pour in half the base curry sauce and let it simmer for 3-4 minutes.
Add the tandoori chicken tikka pieces and stir to coat.
Mix in the mango chutney, mint sauce, and ketchup.
Simmer for 8-10 minutes, stirring occasionally, until the sauce reaches your desired thickness.
Stir in the single cream and add a few drops of red food colouring if using.
Taste and season with garam masala, chopped coriander, and salt as needed.
Serve immediately with basmati rice or warm naan bread.