Mmmmm raspberry syrup sounds really good. Maybe I will just do the recipe for canned apples with a medium sugar syrup and add the spices.Cornstarch is a No-No for canning. Clear-Jell is the substitute.
Last week I made a Raspberry Syrup for pancakes, which was quite thin. The recipe notes, from the Ball Blue Book, said that if the cook were to desire a thicker syrup for serving, to open the can from storage, heat it on the stove just prior to serving, and then add some cornstarch. Only immediately prior to serving, never part of the canning recipe. In my mind, it seems like the same idea would work for apples also, but I haven't tried it. Maybe someone else has?