Try serving some the following foods sliced up on a serving tray.  Serve small slices WITH the rind on and watch everyone's face.  GET YOUR CAMERA READY!!! 

lemons 
fresh or frozen cranberries 
pineapple 
pomegranates 
rhubarb

limes

apricots

strawberries

raspberries

pickles

relish

all flavors of vinegar 
hot sauces

beer

wine

other alcoholic beverages

grapefruit

kiwi

garlic

watermelon

oranges and orange juice

bitter veggies

sour candies