food green radicchio red salad vegetables vegetarian veggies fruit purple striped stripes stripey veg white bitter chicory-family coloring colors colouring colours cook dichorium-intybus edible fresh head herbaceous-plant Italian-chicory leafy-vegetable perennial plant produce raw red-chicory red-leaf-lettuce reddish-purple-leaves round salad-vegetable thin-leaves uncooked vegetable white-veined