Place the seeds into a dry frying pan and toast until just smoking. Place into the Thermomix bowl and mill 1 min/speed 8.
Add onion and chop 5 sec/speed 5. Scrape down and add remaining ingredients.
Cook 60 min/80°C/speed 2/MC OFF with the simmering basket on top to prevent splatter.
Store in a sterilised jar in the fridge until use.
Use in curry recipes as directed.