Grilled Chicken Dijonnais

• 6 chicken breasts (halves)
• 230 gr butter
• 120 ml oil
• 60 ml lemon juice (fresh)
• 16 ml tarragon vinegar
• 10 ml dry wine (white)
• 10 ml strong dijon mustard
• 2 gr pepper (white)
• 2 gr tarragon (dried)