At the first blast of heat, in hot water, steam, or fat, green vegetables get brighter, but with longer cooking the green fades.
What happens? Heat forces the gases surrounding the vegetable cells to expand and escape. As a result, you can see the green pigment, chlorophyll, more clearly. It's rather like fog fading away to let light reveal the color.
Fried vegetables, as in tempura, cook so quickly they stay quite green if eaten hot.
Boiled or steamed (including microwaved) vegetables like green beans, peas, asparagus, broccoli, cabbage, and leafy greens are ready to eat (tender to tender-crisp) while still brightly colored. But if you want to serve vegetables cold or reheat them later, you must stop their cooking with a shock to arrest color change. Drain vegetables and at once immerse them in ice water until cool; this stabilizes the chlorophyll. When reheated, the vegetables don't fade as rapidly as when first cooked. (This is why frozen green vegetables keep their color longer when cooked.)
Vegetables that take more cooking, like artichokes, lose their bright color.
At the first blast of heat, in hot water, steam, or fat, green vegetables get brighter, but with longer cooking the green fades. What happens? Heat forces the gases surrounding the vegetable cells to expand and escape. As a result, you can see the green pigment, chlorophyll, more clearly. It's rather like fog fading away to let light reveal the color. Fried vegetables, as in tempura, cook so quickly they stay quite green if eaten hot. Boiled or steamed (including microwaved) vegetables like green beans, peas, asparagus, broccoli, cabbage, and leafy greens are ready to eat (tender to tender-crisp) while still brightly colored. But if you want to serve vegetables cold or reheat them later, you must stop their cooking with a shock to arrest color change. Drain vegetables and at once immerse them in ice water until cool; this stabilizes the chlorophyll. When reheated, the vegetables don't fade as rapidly as when first cooked. (This is why frozen green vegetables keep their color longer when cooked.) Vegetables that take more cooking, like artichokes, lose their bright color.
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