New answers tagged extracts
The pumpkin flavor you're likely looking for is nothing more than the spices that are added to pumpkin "stuff": cinnamon, nutmeg, cloves, etc. If you attempt to do an extract to achieve "pumpkin essence", you will not be happy with the results. I have been a home brewer (beer, wine, mead, etc.) for 20+ years and have seen many attempts from various brewers ...
A blender is the wrong piece of equipment for this - you need a tool to apply pressure to the hazelnuts, not to mince them to bits. You need a screw press oil-expeller. Hand-cranked models similar to the one in this article start at $125 on Amazon, electronic models begin at just under $200, and then ramp up from there depending on capacity. Search for "nut ...
I doubt you'll get much of a yield. You will probably even have a difficulty creating a hazelnut paste in the blender. Ideally, you would pulverize and then separate with a centrifuge, to extract the oil. Unfortunately, I don't think your options are the right tools for the job.
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