Yes, almond milk was a popular substitute for regular milk in recipes and meals on days when dairy consumption was forbidden. [1] has a modern cook recreating s

Yes, almond milk was a popular substitute for regular milk in recipes and meals on days when dairy consumption was forbidden. [1] has a modern cook recreating some of these recipes, but I've seen similar recipes in older (~10-11th century) stuff from the Islamic world, where it wasn't merely a substitute. The word milk in general could refer to any dairy-like liquid though. According to [2] that usage is attested from as early as ~1200. [1] https://historydollop.com/2016/11/09/almond-milk-the-medieval-way/ https://historydollop.com/2016/11/09/almond-milk-the-medieva... [2] https://www.etymonline.com/word/milk#etymonline_v_16158 https://www.etymonline.com/word/milk#etymonline_v_16158