I was in a health food store and I saw a product called Jungle Nuts. This nut tastes like a peanut, but grows on trees in the Amazon. I did some preliminary checking (please check with a Rabbi, anyway) and learned that this nut in its raw form does not fall into the kitnyiot category. So if you miss having peanuts during Passover, this may be a viable substitute since it is considered more nutrient rich (according to the distributors) than many nut varieties. BTW, it is a little pricey.