Wow, I have never heard of feeding meat to a horse before. I had no idea they could even digest meat.
My horses love carrots, but only like apples if you slice them in quarters. They won't eat whole apples. I usually have something to drink while grooming them, coke or Gatorade most of the time and they both like the Gatorade but can't enough coke. I don't let them get much though, I just poor a little in the palm of my hand and let them lick my hand so they get the taste with out getting too much of it.