Молекулярная гастрономия для креативных шеф-поваров (англ. язык) - страница 144

Молекулярная гастрономия для креативных шеф-поваров (англ. язык)

tends to be slightly on the alkaline side, which will cause a natural red-blue colour change during

cooking.

Therefore to retain the desired red colour, these anthocyanin containing vegetables, for example red

cabbage, should be cooked in the presence of a small amount of acid. Indeed cooked red cabbage

often contains red wine vinegar, or is served with sour cream.

Experiment

Cook red cabbage in a little water. Then add acid to taste and cook further

watching the unappetizing blue-purple color shift rapidly to red.

White vegetables:

Flavone is one the pigments present in white vegetables (like cauliflower). The flavones are soluble in

water and oil so vegetables containing these pigments should only be cooked for short amounts of

time. Like the other pigments the wavelengths of lights that the pigments absorbs and reflects is

affected by pH. The pigment stays white in an acid medium and turns yellow in an alkaline medium.

Therefore, to prevent this undesirable colour change, a small amount of lemon juice, cream of tartar,

or vinegar should be added to the cooking liquid when cooking white vegetables to create a slightly

acidic medium, favourising the desired white colour.

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Yellow and orange vegetables:

Carotenoids are the pigments found in yellow and orange vegetables, like carrots and tomatoes.

Carotenoids are only slightly affected by acids or alkalis.

Vegetables containing carotenoids can be ...

, like carrots and tomatoes.

Carotenoids are only slightly affected by acids or alkalis.

Vegetables containing carotenoids can be cooked for a relatively long time without significant colour

loss because like the other pigments described above, the carotenoids are soluble in fat but insoluble

in water, so the colour of these vegetables are hardly changed by boiling in water – carrots stay

orange and tomatoes stay red.

However, pressure cooking can deform the carotenoid molecules, and changes their structure, and will

alter their colour from reddish-orange to yellow-orange.

The cooking paradox

In general, vegetables should be cooked at high temperatures. High temperatures ensure increased

volatility of volatile compounds, so an improved taste; and ensures the desirable texture changes that

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