Should Chocolate Cocktails Be Shaken Or Stirred? - Tasting Table
Briefly

"If using a cream based liqueur you would shake or build the cocktail to incorporate. Also shake when the cocktail includes cream, milk, or egg white for proper aeration and emulsification."
"If I am using a cacao nib infused spirit or liqueur with spirit-forward cocktails like chocolate-infused Manhattans or Old Fashioneds I stir to maintain clarity and texture."
Read at Tasting Table
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