I believe it is a fruit glazed that is brushed onto the sliced friut. Does look yummy!
You can glaze it with apricot glaze or maybe with sugar syrup?
It's traditionally done with thinned, warm nappage (apricot glaze). If you can't get actual nappage, you can use apricot jam, but after thinning it out and warming it you may need to press it through a fine strainer to make sure that there are no lumps that would interfere with your nice, clean, glossy finish. Also it should be fairly thin. Thin enough to brush on without leaving obvious brush marks... but not watery, as it still needs to cling to the fruit.