Toast seeds in a dry pan over medium-high heat until golden and fragrant - about 4 minutes, timed from the moment you put the pan over your heat source; sesame seeds will be glistening and aromatic; pumpkin seeds will begin to 'pop'.
Transfer immediately to a shallow dish to cool down completely.
Put the seeds in a small food processor and start blitzing - you will need to stop regularly to scrape down the sides of the mixer; add oil as you go and continue to blitz until smooth.
Store in a sealed glass container and keep refrigerated.
