Using poultry shears or any sturdy pair of scissors, cut along each side of the backbone. Remove it. Using a sharp knife, cut partway through the joint between the wings and the breast and do the same between the thighs and also the drumsticks.
Press down on the breastbone to further flatten the chicken. The breast bone will crack.
Dry Brine
Pat the chicken dry with a paper towel then generously sprinkle skin side and underside with salt. Set the chicken skin side up on a wire rack so that air can circulate under and across the chicken. Refrigerate up to 24 hours or at least 3 hours. Do the same with chicken parts.
Heat oven to 425 Degrees or prepare grill for indirect grilling.
In a bowl, mix Spicy Beer Mustard, lemon juice or white wine, soy sauce and olive oil. Blend with a blender or stir vigorously to form an emulsion..
Roast the chicken either in the oven or on the grill until a meat thermometer reaches 135 Degrees or 20 minutes prior to desired temperature then swab the chicken skin-side and underside with the sauce and continue roasting until thermometer reaches 145 Degrees. Remove the chicken from the oven/grill and allow it to rest for 10 minutes then serve.
Note the char on the chicken. Char adds flavor. Enjoy.