Because the vinegar is simply drizzled over the radicchio at the end, try to find an artisan-quality balsamic, such as one labeled _condimento_, if not a premium _balsamico tradizionale_. Radicchio is also good when grilled on a barbecue or in a stovetop grill pan. Oil the grill or grill pan and cook until wilted and slightly charred, turning occasionally, about 5 minutes.
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