Beef tongue in puff pastry

INGREDIENTS1 beef tongue approximately 1.5 kg500 g yeast-free puff pastry150 g champions1 large onion100 g buttersmall bunch of parsley1 tbsp. l. vegetable oil1 tbsp. l. black peppercornsfreshly ground pepper mixturesalt1 egg yolk for brushing STEP-BY-STEP COOKING RECIPEStep 1Wash your tongue with a brush, place in a large saucepan, cover with boiling water so that it…