Yes, roast them first, then grind in the food processor with a little
salt. I had to add a few teaspoons of vegetable oil to get the stuff
to come together.....and it ended up too thin, kind of runny. Maybe
add a teaspoon of oil, grind for a while, add some more, grind some
more. Experimentation is necessary because cashews have different
amounts of oil in 'em.

Best -- Terry