Step 1

Stem the portabellas and wipe them clean. Pour the marinade of choice into a shallow container and arrange the portobello caps, underside down, in a single layer. Let stand for at least 15 minutes and up to an hour. Pour unused marinade back into a bottle for finishing the dish; you'll have enough left over to use for another occasion.

Step 2

To grill: Prepare grill. Grill the portobellos, underside down, for 4–5 minutes. Brush generously with more marinade, then flip and grill for 5 minutes longer or until charred to your liking.

Step 3

To cook in a skillet: Heat a shallow layer of marinade in the skillet. Cook the portobellos, underside down, for 4–5 minutes. Flip and cook for 5 minutes longer, or until browned to your liking. Add a small amount of additional marinade if needed to keep the skillet moist.

Step 4

Serve portobello caps on whole-grain buns with whatever other toppings you'd like. You can place a variety of these toppings and condiments on the table, and let everyone fix their own sandwich!