Ground Turkey Tacos

• 8 tacos
• 4 peppercorns (whole)
• 1 onion (chopped)
• 1 turkey (ground)
• 1 clove garlic (minced)
• 1 egg (slightly beaten)
• 190 gr tomato paste
• 120 ml yogurt (unflavored)
• 120 ml cooking wine (white)
• 80 ml milk