Pesto Pasta with Charred Radicchio

I’ll be the first to admit: Pasta tossed with nothing but good pesto sauce doesn’t need much tinkering. However, I will say radicchio does something extra magical to it. Although the vegetable’s inherent bitterness can be jarring to those unaccustomed, it’s tamed when thrown under the broiler for a few minutes until the edges soften and char. To be sure, it still holds some of its bite, which is a good thing, because it offsets the richness of the oil and cheese-heavy sauce—not to mention i