Yes. The red color is a bonus pigment that contains
beta-carotene, but the cabbage is still classed as a green
vegetable
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Its Collard Greens, and it gets its name from the latin word
"Colla" which means leafy green
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That's any green leafy vegetable. Like spinach.
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No orange colored fruit (orange) or vegetable (carrot, sweet
potato) has the glucosinolates found in leafy green vegetables (and
in cabbage, broccoli and radishes). Leafy greens are also a source
of vitamin K and non-nutritive fiber.
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Spinach can be used fresh in salads as a leafy vegetable, like
romaine lettuce or other salad greens. It can be used like lettuce
on sandwiches. Steamed or cooked spinach is a thick green vegetable
like mustard greens or cooked cabbage.