Add the turmeric to a bowl and set aside.
Heat a dry frying pan over a low to medium heat. Add the pumpkin seeds and toast for 1 to 2 minutes, stirring often, until lightly golden. Tip into the bowl with the turmeric.
Add the sunflower seeds to the pan and toast for 1 to 2 minutes, stirring often, until golden. Transfer to the bowl.
Add the white and black sesame seeds to the pan and toast together for 1 to 2 minutes, stirring often, until the white sesame seeds are lightly golden. Transfer to the bowl.
Add the linseeds to the pan and toast for 1 to 2 minutes, stirring often, until fragrant and just beginning to pop. Transfer to the bowl.
Add the fennel seeds and cumin seeds to the pan and toast for 1 to 2 minutes, stirring often, until fragrant. Transfer to the bowl.
Add the coriander seeds to the pan and toast for 1 to 2 minutes, stirring often, until fragrant and lightly coloured. Crush them lightly in a pestle and mortar so they split slightly, then add them to the bowl.
Stir everything together well so the turmeric coats the warm seeds and spices evenly.
Leave the mixture to cool completely, then transfer to a clean, dry airtight jar
Use as a crunchy topping for salads, soups, yoghurt, grain bowls or roasted vegetables