Grilled Chicken Breast Sandwiches With Roaste

• 6 chicken breast (halves)
• 3 ripe tomatoes for slicing (red)
• 2 bell peppers (red)
• 120 ml mayonnaise
• 75 ml olive oil
• 60 ml dijon mustard
• 45 ml olive oil
• 12 gr thyme (fresh)
• 8 gr black pepper cracked
• 6 gr arugula leaves