In a large pot over medium heat, melt butter.
Brown chicken (whole legs, skin on). When browned, add bacon. Fry for 2 minutes, and add leeks.
Add stock, bring to boil.
Once boiled, reduce to low simmer. Skim surface with spoon to remove chicken residue.
Add bouquet of herbs, prunes, and season with salt and pepper.
Simmer for 1 hour, stirring occasionally.
After the hour, remove bouquet and chicken. Discard bouquet.
Separate the meat from the bones, return to pot.
Serve.