The advertising technique used in this statement is targeting a specific demographic or group of people. By mentioning the word "mirepoix," the grocery store is targeting people who are likely more knowledgeable or interested in cooking and gourmet ingredients. This can be effective as it creates a sense of exclusivity for those who understand the reference and may make them more likely to visit the grocery store to purchase ingredients for their next culinary creation. However, it may also alienate those who are not familiar with the term, so the effectiveness of this technique would ultimately depend on the overall demographic and market of the grocery store.
