Your choice of coffee liqueur will dramatically affect how dry/sweet your Brave Bull is. Reposado or añejo tequila tend to sit more harmoniously with...
I just used a few drops of Angostura Orange Bitters and a couple drops of Woodford spiced cherry bitters. No clue if it's accurate, but it was delicious.
This was introduced to me in simple form (tequila and kahlua) by a Mexican friend in Japan in the 90’s! His family was a multi generational tequila producer. Toro Bravo for the Spanish name! Delicious!