Melt the butter over medium heat, add half the sugar and stir well until the sugar has dissolved.
Spread the pretzel / pretzel sticks pieces in a baking dish and pour the butter / sugar mixture over it; Bake for 10 minutes in a preheated oven at 180 °, then let cool down.
Mix the second half of the sugar with the cream cheese and whipped cream and add the pineapple pieces and the caramelized pretzels: mix everything together well, place in a (casserole) dish or bowl and place in the refrigerator for about 4 hours.