Bīngxiāng lǐ shèng xià de cài còuchéngle yī guō dàzáhuì.
The leftover vegetables in the fridge were thrown together into a pot of hodgepodge.
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大杂烩 literally means 'big mixed stew' — 杂 (miscellaneous/mixed) + 烩 (to braise/cook together in a pot). A dish made from whatever is left over. Hence figuratively: any messy mixture of unrelated things.