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This incredibly flavorful grilled portobello burger is served on focaccia bread with feta and tzatziki, a Greek cucumber dill sauce.

Grilled portobello burger with tzatziki

Looking for some summer grilling options outside the standard hamburger or hot dog?  If you enjoy eating vegetarian or vegan, grilling season can sometimes be a challenge. But we have all sorts of vegetarian grill recipe ideas: grilled romaine, grilled veggie burgers, and even grilled paella! And one of our favorite recipes in terms of juicy, grilled satisfaction is actually a mushroom — this insanely good grilled portobello burger. It’s dressed up with Greek style toppings like tzatziki and feta cheese crumbles. Here’s how to make it!

Related: Summer Dinner Recipes to Eat Al Fresco

Making this portobello burger

Until recently, my least favorite food in the world was the mushroom. However, portobello mushrooms were my gateway into a world of intense appreciation for fungus. If you’ve never tried a grilled portobello burger, you’ll be surprised at how juicy and savory they can be. Mushroom haters — please give this one a chance! They are the perfect carrier for smoky, grilled flavor!

This summer, we’ve developed a new take on the portobello burger with Greek or Mediterranean style fixings. It’s placed on focaccia bread, with the Greek cucumber dill tzatziki sauce. We used mint and dill from our garden, then accessorized with a bit of feta and red onion. It turned out incredibly delicious and has been one of our favorite sandwiches ever since. For a side dish, add a salad of crunchy romaine, juicy tomatoes and Greek salad dressing — or a Greek salad itself!

How to grill portobello mushrooms

Portobello mushrooms are very easy to grill. For our portobello burger, we marinate the mushrooms prior to grilling using balsamic vinegar and olive oil. Let them stand for about 15 minutes while the grill is preheating. When the grill is ready, place the mushrooms on grill and cook them for about 5 minutes per side, until juicy. That’s it! The mushrooms will release quite a bit of liquid and become charred and delicious.

Looking for more grilling ideas?

Outside of this grilled portobello burger, here are a few more grilling ideas:

This portobello burger recipe is…

Vegetarian and gluten-free.

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Grilled Portobello Burger with Tzatziki

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  • Author: a Couple Cooks
  • Prep Time: 20 minutes
  • Cook Time: 10 minutes
  • Total Time: 30 minutes
  • Yield: 4 1x
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This incredibly flavorful grilled portobello burger is served on focaccia bread with feta and tzatziki, a Greek cucumber dill sauce.


  • 4 portobello mushrooms
  • 3 tablespoons aged balsamic vinegar
  • 3 tablespoons olive oil
  • Kosher salt
  • Pepper
  • Focaccia bread (homemade or storebought)
  • Tzatziki
  • 1/2 red onion
  • ⅓ cup feta cheese crumbles


  1. Heat a grill to medium-high heat. Place the portobello mushrooms in a dish or pan and rub the balsamic vinegar and olive oil onto both sides of each with your fingers; use just enough of each to coat evenly. Let sit to marinate until the grill is ready.
  2. Meanwhile, make the tzatziki.
  3. When the grill is ready, grill the portobellos on a medium-high grill for 4-5 minutes on each side, until juicy.
  4. Slice the focaccia bread and thinly slice the red onion.
  5. To serve, place a mushroom on one half of the focaccia bread; top with tzatziki sauce, red onion slices, feta crumbles, and the other half of of the bread.
  • Category: Main Dish
  • Method: Grilled
  • Cuisine: Greek Inspired

About the authors

Sonja & Alex

Hi, we’re Alex and Sonja Overhiser, married cookbook authors, food bloggers, and recipe developers. We founded A Couple Cooks to share fresh, seasonal recipes and the joy of cooking! Our recipes are made by two real people and work every time.

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  1. Elyse says:

    Just made this and it was awesome. Thanks!!

    1. Sonja says:

      Awesome! Glad to hear it worked out – it’s always nice to know when others have had success! Thanks for letting us know :)

  2. Jess says:

    Made this last night, complete with the homemade bread. Delicious. I don’t think I’ll ever buy focaccia again!

    1. Sonja says:

      Wonderful! Glad you tried out the bread too, and that it was a success!

  3. Annie says:

    Must. Have. This. Now!

  4. Riley says:

    I always get grill crazy this time of year. But it’s usually hamburger after hamburger. I’ll have to try this recipe. It should be a great break from the monotonous burgers and hot dogs!

  5. Katrina @ Warm Vanilla Sugar says:

    This looks unreal! Love this idea!!

  6. Emilia says:

    Yum! I love portobellos but would never have thought to make them into a greek inspired meal. Can’t wait to try this soon!