Preheat your oven to 180°C/350°F/gas 4. Season your chicken pieces all over and put them into a snug-fitting pan in one layer. Throw in all the basil leaves and stalks, then chuck in your tomatoes. Scatter the garlic cloves into the pan with the chopped chilli and drizzle over some olive oil. Mix around a bit, pushing the tomatoes underneath. Place in the oven for 1½ hours, turning the tomatoes halfway through, until the chicken skin is crisp and the meat falls off the bone.