Adapted from The Savoy Cocktail Book and Difford's Guide Byrrh is a classic French apéritif. The version most commonly found in France, Byrrh "traditionelle" is shown in the fourth photo but Byrrh Grand Quinina, which is meant to replicate the original apéritif, comes in a more decorative bottle and is what's sold in the United States. It's available at well-stocked liquor stores and is also available online at K & L Wine Merchants, Astor Wines, Slope Cellars, and Liquorama. If you want to mix things up a little differently, I've also seen versions of Byrrh Cassis that use...beer!