Set a large, non-reactive saucepan over medium-high heat. Melt the butter and sauté one-half of the onions, stirring for about 1 minute. Add the pigeons, modulate the heat as necessary, and brown the birds evenly on all sides.
Pour in the wine and let the mixture come to a boil. Add the beef stock, season with the salt, bay leaf and mixed herbs. Bring the liqui