I haven't had the Manana Despues yet, but I fully support it in theory. It's a version of the Fernet Branca Cocktail from the Savoy Cocktail Book, using blanco tequila instead of gin.
Jay from Oh Gosh! has the recipe video with Tiffany Short of The Gibson here. Yes she pronounces Fernet incorrectly, but to be fair I wasn't sure we were saying it right in San Francisco until Count Branca came to town and confirmed it.