Mediterranean Portobello Beef Burgers

These Mediterranean Portobello Beef Burgers are a healthy BBQ recipe topped with garlic herb cheese, roasted red peppers and basil mayo.

Ingredients and substitutions

• Olive oil – any neutral oil like sunflower oil, avocado oil or peanut oil will work in place of olive oil.
• Garlic and herb cheese – this will add great flavour to the burgers. Use grated white cheddar cheese in place of garlic and herb cheese.
• Red bell pepper – use any other bell pepper colour or use another mild pepper like poblano peppers.
• Portobello mushroom – portobello mushrooms are a burger patty size, but you can slice and sauté other mushrooms (like shiitake or cremini) and add them as a topping instead.
• Red onion – replace with white or yellow onion or leave out entirely.
• Arugula – spinach or lettuce would also be good.
• Burger buns – regular burger buns, brioche buns or ciabatta buns would all work.

Burger patties

• Extra-lean ground beef – ground turkey, ground chicken or ground pork can also be used to create the burger patties.
• Portobello mushroom – feel free to use another type of mushroom instead.
• Breadcrumbs – rolled oats, unsweetened corn flakes, crushed potato chips or crumbled crackers can also be used.
• Yellow onion – use red onion, white onion or sweet onion in place of yellow onion.
• Egg – soaked chia seeds, oatmeal or breadcrumbs can be used to replace the egg.
• Dijon mustard – use yellow mustard or brown mustard instead.
• Garlic powder – garlic salt is a great substitute here.
• Salt & pepper – to taste.

Basil mayo

• Light mayo – plain unsweetened Greek yogurt or sour cream can be substituted for light mayo.
• Fresh basil leaves – basil is important to make basil mayo. You can use mint leaves or cilantro but the mayo will have a different flavour.
• Lemon juice – fresh or bottled lemon or lime juice can be used.

How to make this recipe

1. Roast the veggies.
2. Make the burger patties.
3. Grill the burgers.
4. Cook the portobello mushrooms.
5. Make the basil mayo.
6. Assemble your burgers and enjoy!

Removing the Portobello mushroom gills

Mushroom gills are edible but they can create a very bitter taste to the recipe. That's why I always suggest removing the mushroom gills from Portobello mushrooms! To remove the mushroom gills, hold the mushroom in one hand and then use a spoon to scrape out the brown scaley part of the mushroom. Make sure to remove the stem as well!

After removing the gills, wash the mushroom again to make sure it is entirely clean and then pat it completely dry before cooking.

Frequently Asked Questions

Storing and reheating

Reheating a burger can be pretty tricky. With all of the toppings and a bun, it’s pretty difficult to do. To avoid a soggy burger, assemble your burgers as they're being eaten so you can store the ingredients separately in the fridge and reassemble them later.

Extra burgers can be stored separately and this will ensure a much better leftover burger experience. The burger patties and toppings will all keep well in the fridge for 3 to 5 days in airtight glass containers. You can reheat them in a skillet on the stovetop or on the grill for a couple of minutes.

Freezing the beef patties

Freeze extra beef patties by stacking them with a small piece of wax paper or parchment paper in between. This makes it easier to separate the frozen patties.

Place the stack inside of a freezable container or a freezer-safe Ziploc bag. They’ll keep well for 3 to 4 months. When you’re ready to eat, grill them from frozen – just keep in mind they might need to cook for longer.

More homemade burger recipes

• Homemade Big Mac
• Santa Fe Burger
• Juicy Turkey Burgers

Meal prep tools for this recipe

• Grab some glass meal prep bowls if you plan on storing the leftover patties.
• I get all my grass-fed ground beef from Butcher Box, conveniently delivered to me frozen.