That's not always true. I made purple pasta once, quite by accident. The red of the tomatoes really exaggerated the purple of the red cabbage, which would otherwise have lost much of its colour during cooking.
I made it by accident, so I'm not sure if I can remember exactly how it's done, but as far as I remember, you make a sauce with half a jar of pasata & a goodly handful of red cabbage, then when it's all ready, stir it into the pasta (I prefer spirals for this one) and also stir in a couple of spoons full of mayonaise. The combination of oil (from the sauce), tomato & red cabbage makes the colour & the mayo makes the colour more opaque. Try it.
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