Marinate your Portobello mushroom for up to an hour in your favorite salsa.
Heat up your grill to high heat.
Once your grill is hot, place Portobello with stem side facing up. Pour salsa back into Portobello and grill for 10 minutes, letting the salsa get nice and hot.
Meanwhile, grill your favorite veggie toppings: onion, bell pepper, jalapeno, or anything else your heart desires!
Flip your Portobello over (yes you are going to lose the salsa) and cook for 5 minutes with gills facing down.
Once your veggie toppings are all grilled, let your creativity shine and assemble away.