I found this in a book, converted from a medieval recipe. Below that I've done my own quick and easy version. It was my first attempt at a medieval style dish, one that I'd never seen the recipe for elsewhere, except in a archive of Usenet messages. I can't confirm it's medieval origins, the author doesn't include any original recipes or refrences and others complain that she includes non-period ingredients. I did like the results, it was a nice change from what I normally cook.

Peppermint Rice
2 Cups Raw Rice
4 Cups Water
1/4 Teaspoon Salt, more or less to taste
2 Tablespoons Butter
2 Tablespoons firmly packed crushed peppermint leaves, or
2 Teaspoons dried peppermint crushed in a mortar with 2 Tablespoons crushed fresh parsley
Natural green food "paint"

1. In a large, heavy saucepan, combine the rice, water, salt, butter, food coloring, if desired, and peppermint paste. Bring to a quick boil over a high heat.
   
2. Cover, and simmer until all the liquid is absorbed, about 12 to 15 minutes. The rice should be a delicate green color.

Quick and Easy Peppermint Rice
2 Cups instant rice
2 Cups water
1/4 Teaspoon salt
1/2 Teaspoon Peppermint extract
Green food coloring
2 Tablespoons butter

1. In a large, heavy saucepan, combine the rice, water, salt, food coloring, if desired, and peppermint extract. Bring to a quick boil.
2. Remove from heat and cover until all water is absorbed, about 5 minutes.
3. Fluff rice with fork and butter.

The only complaint I've heard is that it needs sugar. I've tried it with sugar and didn't like it as well. Hope you enjoy it.