Slice small top layer of zucchini, set aside. Scrape out inside of zucchini, finely dice, and set aside. Place hollowed out zucchinis on a small sheet pan and roast in oven until softened, about 20 minutes. Set hollowed zucchinis aside to cool. Heat small pan over medium-hit heat. Melt butter in pan and add onion, carrot, celery, and finely diced zucchini guts.

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