Combine garlic, chilli powder, salt, 2 tablespoons lime juice and the oil in a medium bowl. Add chicken and rub with marinade. Let stand at room temperature for no more than 15 minutes.
Preheat grill or barbecue to medium-hot.
Grill chicken 5 cm from heat just until cooked through, 3 to 4 minutes per side.
To make relish, heat stock in a large frying pan. Add corn kernels, capsicum, black beans, onion, chilli and salt. Heat through. Just before serving, stir in coriander and remaining lime juice. Serve chicken topped with relish.
on the menu
To follow a main course featuring grilled chicken, sliced fresh strawberries topped with a purée of frozen raspberries make a refreshing, palate-cleansing dessert.