Add the almonds and cashews to the bowl of a food processor. Pulse until nuts are finely chopped (but do not pulse too long, you do not want the nuts to turn into a paste). Add the dates, lime juice and zest. Pulse until the dates are finely chopped and the mixture starts to clump. Shape the mixture into 1 1/2 inch balls. Roll in coconut to coat outside of the balls. Store in an airtight container in the refrigerator.