Not only is this super fast, the flavors going on here are so good together, believe me you won't even miss the meat!
I take everything out to my grill on a baking sheet all sliced and ready to go, cut fairly thick slices of the tomato and onion so it stands up to the grill when you flip it. With the portobello's I usually clean the gills out, that's just my personal preference, you don't have to.
Everything is brushed with an herb flavored olive oil which takes a couple seconds to make by mixing some fresh or dry basil, with a clove of crushed fresh garlic into some olive oil with some salt and pepper. You can tell the portobello's are done when they shrink and flatten. Be sure to add your cheese so it has time to melt, here I used provolone.
When everything is done toast up your buns, we like ciabatta rolls so that's what I used, but use whatever you like, just get them a nice and golden color.
Buon Appetito!
Spread some leftover warmed marinara or pizza sauce on the grilled bread.
Layer with some arugula
Place portobello, grilled onions, provolone cheese, and the grilled tomatoes on top and serve immediately!
Buon Appetito!