I had a catered lunch the other day that had grilled fruit (apples, pineapples) it was great and I wanted to try it at home.  Are there any tips as far as preparation or what to glaze them with or basic techniques? 
Further to grilled pineapple.  I like to quarter it and then marinate it in a bit of rum (1 oz), a bit of lime juice (1-2 tbsp) and then generously sprinkle some brown sugar over it.  Garnish with mint. 