The site Sweetopia has an extensive tutorial posted about how to make these key to your heart cupcakes using gold leaf! There are tweezers (!!) and paintbrushes involved. I love how much effort went into these - it shows. They are beautiful and would make a gorgeous Valentine's Day cupcake gift. Do check it out. You can also find Sweetopia on Facebook and @sweetopia on Twitter.
How to deliver the key to your heart Valentine's Day cupcakes with gold leaf - a how-to tutorial by Sweetopia
