Grind together all the ingredients that do not come already ground.  Combine very well.

Tricks of the trade:

I buy already ground walnuts and almonds to make my life easier.  I also purchase date paste so I don't have to grind that either.  These are easily available kosher-for-Passover at many kosher groceries.  The rest of the ingredients I process together into a wet paste similar in texture to chummus.  Charoset spice is made by Sadaf and you can get it online; or simply mix equal parts of cardamom, ginger, and cinnamon.  Keep haleg refrigerated and if it gets too thick, thin it with grape juice or even sweet wine to give it a grown up twist!