Interesting. However my horse would disagree with tossing out the apples. All I have to do is quietly say, "apple" and he'll come galloping to me from the far side of his paddock. Nothing else gets that enthusiastic reaction except for his nighttime meal.
one of my horses loves papaya and pineapple , her babby loves mt. dew if i have a bottle of it in one hand and grain in the other she'll take the bottle of dew, before the grain.
My horse loves watermelon and coffee. If I come in with a coffee and set it near him, he'll either knock it off the fence and grab it drink stright from the cup.