Mushrooms in general are great for grilling, and portabellas—which not only have a wonderful, earthy flavor but are also large enough to be easy to handle on the grill—are perhaps the best of all.
Cooks' notes:
•Portabellas can be grilled in batches in a lightly oiled hot grill pan over medium-high heat, turning once, until tender, about 10 minutes per batch.
•Portabellas can be grilled 1 day ahead and chilled. Bring to room temperature before using.