Put the garlic, oil, vinegar, salt and black pepper in your food processor.
Add most of your tomatoes and basil, keeping a little aside for a garnish.
Next, add the chicken and marinade to a large Ziploc bag, making sure the chicken is well-coated.
Seal the Ziploc bag and let your chicken marinate for some 8 hours in the fridge.
Now you can preheat the grill to medium-hot.
Grill the chicken for around 10 minutes, turning it once.
When it’s cooked through, take it off the heat.
Use the reserved basil and tomatoes to garnish it.