INSTRUCTIONS
1. Toss chicken pieces with 1 tablespoon kosher salt. Transfer chicken to a bowl; cover and refrigerate overnight.
2. Whisk buttermilk, pickle brine, hot sauce, and egg together in a mixing bowl. Pour marinade over chicken and stir to ensure each piece is thoroughly coated. Cover and let chicken marinate in refrigerator 2 to 4 hours.
3. Mix flour and salt together in a shallow flat dish. Remove chicken from marinade and blot with paper towels. Reserve marinade. Toss chicken in flour until thoroughly coated. Return chicken to marinade, coating all sides; remove chicken from marinade allowing excess to drip back into the bowl. Coat the chicken once again in flour mixture. Place on a rack. Repeat with all chicken pieces. Allow to sit out about 15 minutes to allow coating to dry out a bit.
4. Place butter and lard in a large pot. Add cayenne pepper, brown sugar, paprika, garlic powder, kosher salt, and black pepper. Place over medium-high heat. Cook and stir until fats melt. Remove from heat; keep sauce warm.
5. Fill cast iron skillet about 1/3 of the way with vegetable oil. Heat oil to 350 °F over medium-high heat. Carefully place chicken into hot oil, skin side down. Maintain an oil temperature of 325 °F, adjusting heat as need. Fry until instant read thermometer reads 160 °F, 8 to 10 minutes per side.
6. Transfer chicken to a rack to drain. Brush with the sauce on both sides.