Grilled Lemon Pepper Chicken Breasts With Thyme Gremolata

• 3 chicken breasts (whole boneless skinless)
• 2 garlic (cloves)
• 1 gremolata
• 1 lemon zest (freshly grated)
• 120 ml extra-virgin olive oil
• 60 ml lemon juice (fresh)
• 8 gr coarsely black pepper (ground)
• 6 gr thyme leaves (fresh)
• 1 slice lemon thyme sprigs (garnish)