Taboo meats, such as horsemeat, are discussed from a historic perspective in this link:

http://www.reference.com/browse/wiki/Taboo_meat

The following link provides several pages of horsemeat recipes from various cultures:

http://www.florilegium.org/files/FOOD-MEATS/horse-recipes-msg.html

Here s a link for  Unmentionable Cuisine , book published in 1979 by the University of Virginia Press that discusses  taboo foods that are acceptable in other cultures and provides many recipes: