All you need is
375g white melting chocolate (I used Nestle White Chocolate Melts)
200g bag of pretzels (I used Parkers)
1/4 tsp citric acid ( I used Mckenzies)
1.Melt your white chocolate according to packet instructions (I used a double boiler for this).
2.When the buttons melt add the citric acid and stir very well to combine.
3. Dip the pretzels in the melted chocolate mixture and leave to set on a piece of parchment paper