Why the overcooked cauliflower emitted a foul lingering odor?

Overcooked cauliflower emits a foul, lingering odor primarily due to the breakdown of sulfur-containing compounds, such as glucosinolates, which release hydrogen sulfide and other sulfur gases during cooking. When cauliflower is overcooked, these compounds are released in higher concentrations, leading to the characteristic rotten egg smell. Additionally, the prolonged exposure to heat can result in the breakdown of other organic compounds, further contributing to the unpleasant odor.