Place the grilled mushroom caps on individual plates, drizzle with pesto, and serve. Preheat the oven to 350 degrees. Spread the pine nuts in a single layer on a baking sheet and toast for 4 to 5 ...
Add sliced red onion followed by the portobello mushroom with cheese on top. If you're a fiend like me, add more pesto mayo to the top bun before crowning and devouring.