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Mozzarella & Portobello Mushroom Burger

Mozzarella & Portobello Mushroom Burger

4.5rating out of 5

(1988 reviews from our customers)

Prep Time

35 min



By combining roasted portobello mushroom with garlic-infused mozzarella in deliciously crusty ciabatta, you'll create a hugely satisfying veggie burger. Served with a chunky olive and caper salsa and roasted waxy potato wedges on the side, this burger makes for a moreishly Mediterranean flavour sensation!

Prep Time

35 min



What is Gousto all about?

We send you everything you need to cook amazing recipes like this, delivered right to your door. Leave the planning to us!

What is Gousto all about?

We send you everything you need to cook amazing recipes like this, delivered right to your door. Leave the planning to us!

For 2 people (double for 4)
1 red onion
2 tomatoes
1 garlic clove
basil 3.18
10g basil
15g capers
30g pitted black olives
125g mozzarella †
300g waxy potatoes
150g portobello mushrooms
Ciabatta new
2 ciabatta rolls
You Will Need
Olive oil, pepper, salt

Nutritional Information*

Percentages are based on an adult's daily intake

  • 1 red onion
  • 1 tomato
  • 1 garlic clove
  • 10g basil
  • 1 bag of capers (15g)
  • 1 bag of pitted black olives (30g)
  • 125g mozzarella ball<span class="strong">†</span>
  • 300g waxy potatoes
  • 130g portobello mushrooms
  • 1 ciabatta roll
Typical Values per 100g per serving
Energy 479 kJ
113 kcal
2074 kJ
491 kcal
of which saturates
3.3 g
1.9 g
14.5 g
8.2 g
of which sugars
15.6 g
2.1 g
67.4 g
9.1 g
Fibre 1.7 g 7.5 g
Protein 5.5 g 23.6 g
Salt 0.49 g 2.13 g
*Gousto’s nutritional information only applies to ingredients supplied by Gousto. The cooking process and additional ingredients added at home (listed under “What you’ll need”) will affect total values.
Ingredients contain
1 red onion
red onion
1 tomato
1 garlic clove
10g basil
basil (100%)
1 bag of capers (15g)
Capers, water, vinegar, salt.
1 bag of pitted black olives (30g)
water, pitted black olives, salt, ferrous gluconate
125g mozzarella ball
pasteurised cows milk, salt, microbial rennet, citric acid
300g waxy potatoes
130g portobello mushrooms
1 ciabatta roll
wheat flour (gluten) 52% (with calcium, iron, niacin, thiamin), water, wholemeal wheat flour (gluten), rye flour (gluten), salt, fresh yeast
  • Allergens highlighted by † (milk)

In addition to the recipe specific allergen information provided, due to production and packing methods Gousto boxes may also contain low levels of the following allergens: Cereals containing gluten; Crustaceans; Eggs; Fish; Peanuts; Soya; Milk; Nuts: almonds, hazelnuts, walnuts, cashews ,pecan nuts ,brazil nuts, pistachio nuts, macadamia nuts; Celery; Sesame; Sulphur dioxide and Sulphites; Lupin; Molluscs; Mustard.

Cooking Instructions
Instructions for 2 people (double for 4)
1 Melty Mushroom Burger

Preheat the oven to 220°C/ 200°C (fan)/ 425°F/ Gas 7

Cut the waxy potatoes into bite-sized chunks, place on an oven tray and coat with 1-2 tbsp olive oil

Season generously with salt and pepper and put in the oven for 20-25 min or until golden

2 Melty Mushroom Burger

Meanwhile, peel and finely dice the red onion[s]

Chop the tomatoes coarsely 

Chop the basil coarsely, including the stalks

Drain, rinse and chop the black olives into 'O's

Peel and finely chop (or grate) the garlic

3 Melty Mushroom Burger

Combine the chopped tomato, chopped basil, capers, black olives and 2-3 tbsp olive oil

Add about half of the diced onion (go easy if you don't like raw onion!)

Mix well and season lightly with salt and pepper – this is your salsa

Set aside until serving

4 Mozzarella & Portobello Mushroom Burger

Remove the stalks from the portobello mushrooms and keep them for the next step

Drizzle the mushrooms with olive oil, place on an oven-proof tray and put in the oven with the potatoes

Cook for 10 min or until tender

5 Melty Mushroom Burger

Chop the mozzarella and mushroom stalks coarsely

Mix with the chopped garlic and remaining diced onion

6 Melty Mushroom Burger

Remove the mushrooms from the oven and pour any liquid away

Spoon the mozzarella mix onto the mushrooms

Return to the oven for 10 min or until the cheese is melted and golden

7 Melty Mushroom Burger

Place the ciabatta rolls on an oven tray (use the mushroom tray if you want to save space) for 8-10 min

Once done, remove the ciabattas from the oven and cut open (carefully!)


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Place each mushroom on a ciabatta and top with the salsa

Serve the potatoes on the side


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