Actually, mutton was first cooked in Kentucky by Virginians. Two Virginia families moved west to Kentucky and cooked a mutton served with peach syrup in 1805. They were the families of Abraham Lincoln's parents. BBQ mutton was the meat served at Abraham Lincoln's parent's wedding. Until 1792, Kentucky was actually Kentucky County, VA.
From the old book
The Life of Abraham Lincoln:
Drawn from Original Sources and Containing Many Speeches, Letters and Telegrams