How Long to Cook Grilled Portobello Mushroom Caps in the grill
Specification: 4 large portobello caps (~4-inch diameter), stems removed, dark gills scraped out with a spoon, brushed with olive oil and salt on both sides
3-Step Execution Protocol
Preheat grill to Medium-high direct, 425°F (218°C). Clean and oil grates. Prepare grilled portobello mushroom caps (4 large portobello caps (~4-inch diameter), stems removed, dark gills scraped out with a spoon, brushed with olive oil and salt on both sides).
Cook for 8–12 mins (5–7 min gill-side up first, 3–5 min gill-side down last). Flip at the 6-minute mark for even browning.
Caps have collapsed from firm-domed to soft-floppy, the tops carry deep grill marks, and a fork slides into the centre of a cap with no resistance and releases dark liquid. Rest for 2 minutes before serving.
No internal temperature target — portobellos are a texture-and-colour finish, so internalTempTargetF is omitted per HR-2, consistent with other vegetable entries in this dataset. Direct-heat time range and gill-removal guidance from the Weber Grilling Guide grilled-vegetables chart and America's Test Kitchen grilled-portobello technique.