Puff pastries filled with jam and walnuts with homemade dough

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Dough ingredients:
( 90 Pieces )
1 kg of 650 flour
400 ml mineral water
100 ml white wine
150 g sour cream
4 egg yolks
1 teaspoon salt
2 tablespoons vinegar
1 teaspoon vanilla extract
To grease the dough :
700 g OSANZA, pork fat
finely chopped (fat butter)
200 g flour
Filling:
1 x 325ml jar plum jam
100 g ground walnuts
To sprinkle:
100 g icing sugar