If you did guess tomato, you are absolutely right. It is sheer coincidence that the tomato should be the protagonist yet again. This is a steamed tomato that's been skinned and dressed in a marinade of orange juice, balsamic vinegar and orange zest. I was trying a play on sweet and sour since no one expects this to be a tomato. Truth be told, it looks better than it tasted but it was a very interesting combination. The sharp orange zest gives way to the soft touch of the tomato flesh which squirts tangy juice as soon as you bite into it... quite a medley of flavors.
Next time, I think I'll go light on the orange zest but not on the zest for experimenting with food.
ps: I just bought the Microplane zester - super cool.