A portobello burger sounds upscale and seems therefore more difficult than it is though!
So what is a portobello, it is actually a large brown mushroom.
Marinate the portobello (instead of the burger), grill it and then stack the bun like you do regularly.
I really wanted to give the meat flavor to the burger, so that you will not notice a lot of difference.
This worked very well using meat herbs (works every time).
It really seems like you eat a special luxury meat burger! It is a perfect sandwich if you want to eat a hamburger or lighter if you’re vegetarian. I like to serve it with a salad.
This is how I do it
Make the portobello and cut the stalks out.
Place in a shallow dish and pour two tablespoons red wine and two tbsp balsamic vinegar over it with a tbsp fresh rosemary and a little meat seasoning.
Let that marinate for half an hour. Then cut the buns.
Heat a grill pan with oil, add the portobello and turn it every five minutes for about 20 minutes.
Add in the last five minutes cheese and let it melt altogether.
Grill the bread rolls in a toaster or on the grill for a few minutes or you get a crispy layer.
Put a few (washed) spinach leaves on the bun, then place the portobello out and finally get some sliced tomatoes. That’s all!