Fill a chimney starter up with good quality lumpwood charcoal, light with a fire starter then leave to get white hot.
Once the charcoal is ready, tip it into a kettle bbq, so that it sits in an even layer on one side. Pop the grate & lid back on the bbq & leave to heat up for 5 minutes or so. We want the temperature bbq to sit around 200°c/400°f.
Next, place the chicken on the cooler side of the grill, so that it is facing skin side up, with the legs pointing towards the hotter side. Add the lid back on the bbq then cook the chicken for 20 minutes.
After 20 minutes, carefully turn the chicken so that the breasts & wings are now facing the charcoal then continue cooking until the internal temperature in the thickest part of the breasts reaches 65°c/150°f. This will take another 15 minutes or so.
Flip the chicken over, so that it's facing skin side down & sitting directly over the charcoal. Continue cooking until the skin is crisp & the internal temperature of the meat reaches 74°c/165°f. This will take another 5-10 minutes.If the skin starts to brown too much, move the chicken back over to the cooler side of the grill. Make sure to keep the lid closed on your bbq. Once cooked, transfer the chicken to a large plate & leave to rest for 10 minutes, covered loosely in foil.
In the meantime, cut a lemon in half then grill on the bbq until well charred.