Medallions Of Veal With Pistachio Butter Sauce

• 2 per person with pistachio butter sauce
• 1/4 medallions (thick)
• 1,000 gr veal loin (boneless)
• 130 gr butter (cold unsalted)
• 120 ml water
• 120 ml burgundy wine (white)
• 65 gr coarsely (chopped)
• 60 ml wine vinegar (white)
• 34 gr shallots (finely chopped)
• 18 gr butter (unsalted)