Portabello mushrooms, when fully matured, are about the size of the a traditional ground beef burger. And this makes them perfect for grilling and creating a vegetarian-type burger.
For a bit of information, the nutritional value of a Portabello (sometimes spelled Portobella) is high in vitamin B, and they are naturally low in cholesterol and fat free, along with being nearly calorie-free. Smaller Portabello mushrooms are called Crimini, indicating a younger, unopened form of this mushroom. Crimini mushrooms are very tasteful in salads, sauted to be used as a pizza topping, and to be used in sauces (see my article on How To Saute Mushrooms and How To Make Condensed Mushroom Soup).
But now with your mouth watering for a burger, let's continue with this recipe. And, any burger is not complete without various condiments.
For this Portabello Burger, you will need:
- An open, hot grill
- Pastry brush
Ingredients for One Burger:
- 1 Portabello mushroom, stem removed and veins scraped out
- Olive oil
- ½ avocado, thinly sliced
- 1 slice of fresh tomato
- 1 slice of Provolone cheese
- Mayonnaise to taste
- Salt and pepper to taste
- 1 bun, preferably a Kaiser Roll
Prepare Burger:
- After cleaning mushroom, brush with olive oil using the pastry brush.
- Place on hot grill, bottom side down first.
- In the meantime, slice avocado and tomato, and butter Kaiser Roll (and, if desired, can be placed on upper rack of grill to toast the roll).
- After 2-3 minutes, turn over mushroom.
- Place slice of cheese on mushroom (it will melt into the “cup” of the mushroom) and continue grilling.
- When both the mushroom is softened and the is roll toasted, remove from grill.
Assemble Burger:
- Place mushroom on bottom half of roll.
- Top with tomato slice and avocado slices.
- Salt and pepper to taste.
- Spread mayonnaise on top part of roll.
- Place top part of roll on burger and eat!
Let me know if I have converted you to a vegetarian burger.


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