Scoop a little nut butter into the dates, top with a walnut half, sprinkle on the teensiest amount of salt and put in the freezer for 10 minutes. Voila.
NOTES: you can use any variety of dates, medjools work well because they are giant, but lately I've been preferring Bam dates (aka Mazafati dates, according to wikipedia). You can use any nut or seed butter you like. You can add whatever toppings you want, I threw on some sesame seeds for aesthetic reasons here. And use any nut to top the bites with! I just had walnuts nearby me so I used walnuts.