Balsamic Glazed Chicken With Grilled Treviso

• 6 radicchio di treviso
• 2 garlic (cloves)
• 2 onion (red)
• 1 disks
• 1 glass lambrusco
• 1,100 gr chicken
• 60 ml balsamic vinegar (plus)
• 45 ml virgin olive oil
• 30 ml extra-virgin olive oil
• 24 gr prosciutto rind