This is one you are very unlikely to find at a curry house, or anywhere else for that matter. This recipe can be easily crafted in a conventional oven.
Blend all the marinade ingredients into a paste or pound them using a pestle and mortar.
Slowly drizzle the rapeseed (canola) oil into the paste, whisking continuously until you have a smooth emulsion. Cover the chicken inside and out with the marinade and allow to marinate for 8 hours or overnight. I carefully rub about half of the marinade under the skin but don't worry if you can't be bothered.
Set up the barbecue for indirect cooking.
Drink half the can of beer or lager and add a teaspoon of the marinade from the chicken dish to the can. The beer might foam up when you add the marinade, but that isn't a problem.
When your barbecue is good and hot, you're ready to cook. If you have a thermometer, aim for a cooking temperature of 190-200°C (375-390°F). Place the chicken on the beer can and stand it directly on the barbecue on the side with no coals. Cover and cook for about 1-1¼ hours until the chicken is cooked through and the juices run clear when stuck with a knife in the thigh. You can't be too careful with chicken so if you have a meat thermometer, check that your chicken is 82°C (180°F).
When cooked through, transfer to a serving plate and cover with foil to sit for about to minutes before serving.