Just in case you are replacing the apples with peaches, the peach skins have the most intense flavor of the fruit. Remove the pits, and dice the peaches. Cook, adding other flavors as required, the blend to incorporate the skins smoothly into the sauce. As I don't know the rest of the sauce ingredients, I can't really help more. Understand that peaches are more tart than most apples, so adjust your recipe accordingly.
A peach mop would work very well with pork, poultry, duck, goat, venison, or lamb. It would also be good on rabbit.
Hope that helps.
Seeeeya; Chief Longwind of the North