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Using a chef's knife or other large knife chop the white chocolate rather finely and place in a double boiler over medium heat along with the cream.
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Using a microplane grater, zest one lemon into the chocolate/cream mixture. Steer clear of the bitter white pith.
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Stir chocolate mixture occasionally while waiting for the chocolate to melt .
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As soon as a smooth mixture forms, remove from the heat and allow mixture to cool slightly.
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Place chocolate/cream mixture in the fridge for at least two hours or until completely solid.
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After two or so hours, remove the now solid mixture from the fridge and allow to warm up for about 5-10 minutes at room temperature.
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Using a metal spoon, melon baller or similar dig out a tablespoon of the mixture (some force will be required here) and use your hands to quickly form it into the shape of a ball. Then deposit onto a tray, a piece of parchment paper or similar.
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Fair warning: The heat from your hands will melt the mixture quicker than you think. Work quickly. This will be messy. But fun! ;)
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Repeat with the rest of the mixture until you have 6-10 white chocolate truffles.
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On a cutting board or other large, clean surface, spread the chopped pistachios into a thin layer, then sprinkle another thin layer of popping candy (if using) on top.
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One by one, roll the chocolate truffles in the popping candy/pistachio mass to form an even coating. There will be some popping and hissing as you do.
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Pop onto a tray or serving platter and serve immediately or keep in the fridge for up to a few hours.