I discovered a month or so ago that if you put spinach in a smoothie that has blueberries in it, it is virtually undetectable. We make a smoothie most mornings and here is one basic recipe (and I use the word "recipe" quite loosely):
blueberries (all fruit is frozen) strawberries raspberries spinach green tea or juice or even Crystal Light lemonade vanilla yogurt
Just don't try the spinach without the blueberries there to mask it!
Hmmmm...I wonder if we could use this trick to get Aunt Jamie to eat vegetables??? That might be the true test! ;)