The casual apéro dînatoire takes a page from cocktail hour. But there are still rules.

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Source: https://www.washingtonpost.com/lifestyle/food/the-newest-recipe-for-a-french-dinner-party-less-cooking-and-more-relaxing/2019/05/09/eec01b88-71d2-11e9-8be0-ca575670e91c_story.html