In a manner relating to gastronomy; concerning the art of good eating and cooking; from a culinary perspective.
From gastronomic(al) + -ally (adverbial suffix). This adverbial form allows speakers to describe actions or qualities in relation to food and cooking excellence.
Adding '-ally' to adjectives to make adverbs is one of English's most productive grammar rules—and 'gastronomically' shows how you can build increasingly fancy food-related words!
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