Stick with freeze-dried raspberries: Fresh raspberries contain too much moisture for this filling. Freeze-dried fruit gives you concentrated raspberry flavor without making the chocolate mixture too wet.
Grind whole raspberries finely: If you're starting with whole freeze-dried raspberries rather than powder, process them until very fine. About 0.88 ounces gives you the amount needed for this recipe.
Don't overheat the chocolate: Microwave both chocolates in 15-second intervals and stir each time. Chocolate can continue melting as you stir even when a few small pieces are still visible.
Watch the first chilling time: I wouldn't go far from the fridge during those 10 to 15 minutes. You want the filling firm enough to roll but not so hard that it's difficult to scoop.
Keep them chilled: I think these are much better straight from the refrigerator, when the center is firm and the chocolate coating has a little snap.
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