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Cheesy Caramelised Onion and Mushroom Gratin

with Garlicky Cabbage
Sam Richards
Sam RichardsUpdated on January 16, 2026
Calories
772 kcal
Protein
19.8g protein
Total
40 minutes
Difficulty
Easy
Allergens:
  • Milk
Produced in a facility that processes eggs, milk, fish, peanuts, sesame, shellfish, soy, tree nuts, and wheat.
serving amount

450 grams

Potatoes

2 unit(s)

Onion

4 unit(s)

Garlic Clove

60 grams

Mature Cheddar Cheese

(Contains: Milk)

80 grams

Sliced Mushrooms

150 grams

Creme Fraiche

(Contains: Milk)

15 grams

Vegetable Stock Paste

40 grams

Fig Jam

150 grams

Shredded Savoy Cabbage

Not included in your delivery

100 milliliter(s)

Reserved Potato Water

1 tsp

Sugar

20 grams

Butter

Energy (kJ)3230 kJ
Energy (kcal)772 kcal
Fat44 g
of which saturates26.9 g
Carbohydrate77.6 g
of which sugars28.1 g
Dietary Fibre11.1 g
Protein19.8 g
Salt2.4 g
Potassium1190 mg
Calcium57.8 mg
Iron1.1 mg
Due to the different suppliers we purchase our products from, nutritional facts per meal can vary from the website to what is received in the delivered box, depending on your region.
Garlic Press
Box Grater
Colander
Large Saucepan
Large Frying Pan
Baking Tray
Oven dish

Instructions

1

Preheat your oven to 220°C/200°C fan/gas mark 7.

Bring a large saucepan of water with 0.5 tsp salt to the boil for the potatoes. Peel and slice the potatoes into 1cm thick rounds.

Halve, peel and thinly slice the onions. Peel and grate the garlic (or use a garlic press). Grate the cheese.

Once boiling, add the potato slices to the water and simmer until just tender, 8-12 mins. Once cooked, reserve some of the potato water (see pantry for amount), carefully drain in a colander.

2

While the potatoes are boiling, heat a drizzle of oil in a large frying pan on medium heat. 

Once hot, add the onions and mushrooms. Season with salt and pepper and fry, stirring occasionally, until golden, 10-12 mins.

Next, add the half the garlic and sugar (see pantry for amount). Cook until caramelised, 1-2 mins more.

3

Once the onions and mushrooms have caramelised, add the creme fraiche, vegetable stock paste, reserved potato water and half the cheese to the pan.

Mix together, bring to the boil, then remove from the heat. Season to taste with salt and pepper.

4

Lay half the cooked potato slices in layers in an appropriately sized ovenproof dish and pour over half the creamy onion and mushroom sauce. Drizzle over half the fig jam.

Repeat with the remaining potatoes, creamy sauce and fig jam, then sprinkle over the remaining cheese to finish.

Bake on the top shelf of your oven until golden brown and bubbly, 15-20 mins. TIP: Put the dish onto a baking tray to catch any drips.

Meanwhile, give your frying pan a quick wipe clean.

5

When your gratin is nearly ready, heat a drizzle of oil in the (now empty) large frying pan on medium heat.

Once hot, add the cabbage and remaining garlic. Stir-fry for 2 mins.

Season with salt and pepper, add a splash of water, mix well and cover with a lid (or foil). Cook until just tender, 3-4 mins.

Once cooked, stir in the butter (see pantry for amount) until melted, 1 min. Remove from the heat.

6

Carefully slice your potato gratin into portions and share between your plates.

Serve with the garlicky cabbage on the side. 

Enjoy!

Customer reviews

Review summary

Updated on Feb 2026
  • Flavour: Many found this dish delicious, with some calling it their new favourite for its depth of flavour and tasty combination of ingredients.
  • Ease of prep: Several noted the recipe was simple to follow, though some found the cooking times longer than suggested.
  • Suggestions: Consider adding more mushrooms for substance; try using a stronger cheese or cheese blend to boost flavour.
  • Portions: Some felt it was quite filling as a main dish; others suggested serving it as a side or adding extra vegetables.
  • Texture: A few reviewers recommended adjusting potato cooking methods for better consistency and crispiness on top.
AI-generated from customer reviews

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