Remove the backbone of the chicken. Turn the chicken over and press down on the chicken breast sternum to flatten it.
Dry the chicken well on all sides with paper towels. Add it to a bowl and rub it down with the juice of 1 lemon, including underneath the breast skin.
Generously season the chicken on all sides with salt. Set it to the side at room temperature.
Make the peri peri sauce and divide it into two containers.
Using 1 portion of the sauce, generously coat the chicken, rubbing it down on all sides and underneath the skin.
Cover it and store it for 4 to 48 hours. In the refrigerator.
Heat your gas grill, smoker, or charcoal grill to high heat, which is between 500° and 600°.
While the grill is heating, remove the chicken from the refrigerator and set it at room temperature for about 30 minutes to remove the chill.
When the grill is preheated, Place the flattened chicken skin side down. Immediately turn the heat down to medium.
Cook for a total of 8 to 12 minutes or until charred grill marks are formed on the skin side. I like to cook for 4 to 6 minutes then turn it 90° and cook for a further 4 to 6 minutes.
Carefully flip the chicken over and cook for 30 to 40 minutes or until the thickest part of the chicken reads about 160° to 162°.
During this process, baste the chicken every 10 minutes with the cooked peri peri sauce.
Remove the chicken and let it rest for 5 to 7 minutes. During this time, you can optionally grill a few lemon halves.
Serve the chicken with optional lemons and additional peri peri sauce.
Notes
Make-Ahead: You can make this up to 30 minutes ahead of time. Just keep it covered in a pan in the oven or in a grill at low temperatures (<200°).How to Store: Place covered in the refrigerator for up to 5 days. This will freeze covered for up to 3 months. Thaw it in the refrigerator for 1 day before reheating.How to Reheat: Add the desired amount of peri-peri chicken to a 13×9 casserole dish with ½ cups of water and cover with foil. Bake at 375° for 10 to 12 minutes or until hot.A flattened chicken is a whole chicken with the backbone removed. This is also known as a spatchcock chicken.Feel free to freeze the chicken backbone to use in chicken stock later.If you notice too many flames shooting through the grill, add a few ice cubes to those hot spots to help tame the fire without any big puffs of smoke.Grilling lemons helps to soften them so they can extract more juice when being squeezed.