Gluten-free · 30 min
Balsamic Portobello Burger with Caramelized Onions & Side Salad
- 30 min
- 2–6 servings
- 653 kcal / serving
A hearty mushroom burger with melted mozzarella, sweet caramelized onions, and a tangy vinegary dressing, paired with a crisp side salad. It's a straightforward weeknight option with satisfying textures and balanced flavors.
Free on iPhone · servings scaled, grocery list written for you.
Ingredients
- ½English cucumber
- 2 clovesgarlic
- ⅓ (8 oz) blockmozzarella cheese
- 2 capsportobello mushrooms
- ½ headromaine lettuce
- 1tomato
- 2whole grain buns or rolls
- 1 mediumyellow onion
- tomatoes
- yellow onions
- English cucumbers
From the pantry: balsamic vinegar, Dijon mustard, extra virgin olive oil, garlic powder, honey, Italian seasoning, mayonnaise, salt
Cookware
chef's knife · colander · cutting board · garlic press (optional) · measuring spoons · mixing bowls · nonstick skillet · small saucepan · stirring spoon · toaster (optional) · tongs · whisk or fork
Kitchen help: cups to grams · tablespoons to cups · oven temperatures · butter conversions · what each cooking tool is for · ingredient substitutes
More dinner ideas: easy dinners
Shopping list by aisle
Produce
- ½English cucumber
- 2 clovesgarlic
- 2 capsportobello mushrooms
- ½ headromaine lettuce
- 1tomato
- 1 mediumyellow onion
- tomatoes
- yellow onions
- English cucumbers
Dairy, eggs & chilled
- ⅓ (8 oz) blockmozzarella cheese
Bakery & bread
- 2whole grain buns or rolls
3 aisles for this recipe. Plan a week in MealPot and it merges every dinner into one list in this order, scaled to your household.
Ingredients for 2, 4 and 6 servings
| Ingredient | 2 servings | 4 servings | 6 servings |
|---|---|---|---|
| English cucumber | ½ | 1 | 1 ½ |
| garlic | 2 cloves | 4 cloves | 6 cloves |
| mozzarella cheese | ⅓ (8 oz) block | ⅔ (8 oz) block | 1 (8 oz) block |
| portobello mushrooms | 2 caps | 4 caps | 6 caps |
| romaine lettuce | ½ head | 1 head | 1 ½ heads |
| tomato | 1 | 2 | 3 |
| whole grain buns or rolls | 2 | 4 | 6 |
| yellow onion | 1 medium | 2 medium | 3 medium |
Quantities in US units. Any other household size: MealPot scales the recipe and the grocery list for you.
Directions
- Slice the onion and cook it in a bit of oil with a pinch of salt in a pan over medium heat until soft and deeply colored, about 15–20 minutes to form caramelized onions.
- Prepare the mushrooms by removing stems and scraping out the gills. Toss them in a bowl with the marinade and set aside.
- Whisk together mayo, oil, Dijon, garlic powder, and a pinch of salt to make aioli and set aside.
- In a skillet over medium-high heat, cook the marinated mushrooms until they are tender, about 3–5 minutes per side. Top with mozzarella and cover until the cheese melts, 2–3 minutes.
- In the same bowl used for the mushrooms, add the dressing ingredients from the leftover marinade along with honey, oil, Dijon, and salt, then whisk to combine.
- Tear or chop the romaine and cucumber, and chop half the tomato; add them to a bowl with the dressing and toss to coat. Slice the remaining tomato and reserve.
- Toast the buns if desired, spread aioli on the bottom buns, layer with lettuce, tomato, the mushroom caps with melted cheese, and caramelized onions, then cap with the top buns.
Two tips
- Prep the caramelized onions ahead and refrigerate for use later in the week.
- For a different texture, swap the mozzarella for any other cheese you have from the pantry list or use on hand.
Nutrition per serving
- Calories
- 653 kcal
- Protein
- 20 g
- Carbs
- 44 g
- Fat
- 46 g
- Fiber
- 10 g
- Sodium
- 504 mg
Estimates from the recipe's published nutrition data; they change with the version you pick above.
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Ingredient quantities, timing and nutrition follow the original Mealime recipe ↗ (captured 2026-09-12). The photo is MealPot's AI-rendered illustration of the finished dish; the description, directions, aisle list and serving table are MealPot's.