Radicchio may look like red cabbage to the untrained eye, but their outward appearance is where the similarities end. Radicchio has a strong, bitter flavour that accompanies other powerful food flavours extremely well.well with similarly strong ingredients and dressings. In appearance, it has bright to dark red coloured leaves, with white veins. Radicchio is one of the few salad greens that can be cooked – usually grilled or braised. Its leaves are rounded in shape and reasonably soft in texture, and it’s available all year round.