Pork fillet rolled with leek butter | Pork fillet recipe

Ingredients

• Garlic butter, up to taste
• Finely chopped parsley, up to taste
• 1 pork fillet (opened into pocket)
• White wine up to taste
• Soy sauce, up to taste
• 1/2 package of 250 g (2 cups) of Les Cultures de chez nous sliced leeks
• 125 ml (1/2 cup) of soft butter
• 15 to 30 ml (1 to 2 tablespoons) of mustard