One of the benefits of a garden is fresh herbs. (If you grow mint, grow it in pots–otherwise it will take over any area that is watered including grass, garden, the side of the house if wet enough, the dog’s water dish…)

When making mint icing from fresh mint, it is going to have a lighter mint flavor than if you use extract. It’s quite subtle and delicate; a top-note to the chocolate.
To make fresh-mint chocolate icing, you need to prep the night before:
Cut three or four fresh sprigs of mint, wash, pat dry with a paper towel and then discard the stems, saving the leaves. I use about ten leaves.
Chop the leaves or fold and crush them a bit.
Place the leaves in a very small container with about 4 tablespoons of buttermilk.
Leave the mint in the buttermilk at least overnight in the refrigerator. The fat in the buttermilk will soak up the mint oils. The longer you soak and the more leaves you soak, the stronger the mint flavor will be.
The next day, when you are ready to make the chocolate icing, strain the buttermilk from the mint into a saucepan. You need about two tablespoons of buttermilk, which will make plenty of icing to cover an 8 to 9 inch brownie or cake pan. Discard the rest of the buttermilk or use it all if you want to double this recipe.
Add to the saucepan:
2 tablespoons cocoa powder
2 tablespoons butter or margarine
Heat over low heat, stirring until all butter is melted and the chocolate is mixed in well. Remove from heat, stir in powdered sugar until icing is desired consistency (about 16 oz of sugar makes a pretty standard icing. Less sugar creates a nice drizzle.)
Use the icing on brownies, on cakes or cookies. You can make a layer of mint icing without the chocolate by leaving out the cocoa. I’ve seen recipes that do the layer without the cocoa and use green food coloring. You can then layer another layer of chocolate icing on top for effect.
Another great icing is orange/cocoa. Substitute minced orange peeling in place of the mint (about a tablespoon). You’ll need more buttermilk when you soak the orange peelings because the peeling soaks up a bit of the moisture. Orange/chocolate icing is a great treat, especially on shortbread or sugar cookies!