Cheesy Caramelised Onion Beef Burger
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Cheesy Caramelised Onion Beef Burger

with Fries and Baby Leaf Salad

Family Friendly
Cereals containing gluten

Boxes and ingredients are packed in facilities that handles Peanut, Nuts, Sesame, Fish, Crustaceans, Milk, Egg, Mustard, Celery, Soya, Gluten and Sulphites. Due to the war in Ukraine, it has been necessary to substitute sunflower oil with rapeseed oil in some products without a label change. The FSA have advised that allergic reactions to rapeseed oil are rare.

Preparation Time40 minutes
Cooking time30 minutes


serving amount

450 grams


2 unit(s)

Garlic Clove

10 grams


(Contains Cereals containing gluten)

17 grams

Wholegrain Mustard

(Contains Mustard)

240 grams

British Beef Mince

1 unit(s)


15 milliliter(s)

Cider Vinegar

(Contains Sulphites)

30 grams

Mature Cheddar Cheese

(Contains Milk)

2 unit(s)

Burger Buns

(Contains Cereals containing gluten May contain Milk, Egg, Soya)

20 grams

Baby Leaf Mix

Not included in your delivery

¼ tsp

Salt for the Breadcrumbs

2 tbsp

Water for the Breadcrumbs

20 grams


1 tsp

Sugar for the Onions

¼ tsp

Sugar for the Dressing

½ tbsp

Olive Oil for the Dressing

4 tbsp



Nutritional information

Energy (kJ)4329 kJ
Energy (kcal)1035 kcal
Fat58 g
of which saturates19 g
Carbohydrate87.3 g
of which sugars13.3 g
Protein43 g
Salt2.68 g
Always refer to the product label for the most accurate ingredient and allergen information.


Chopping Board
Baking Tray
Large Bowl
Box Grater
Small Bowl
Large Frying Pan



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

Chop the potatoes lengthways into 1cm slices, then chop into 1cm wide fries (no need to peel).

Pop the fries onto a large baking tray. Drizzle with oil, season with salt and pepper, then toss to coat. Spread out in a single layer. TIP: Use two baking trays if necessary.

When the oven is hot, bake on the top shelf until golden, 25-30 mins. Turn halfway through.


Meanwhile, peel and grate the garlic (or use a garlic press).

In a large bowl, combine the garlic, breadcrumbs, half the mustard and the salt and water for the breadcrumbs (see pantry for both amounts), then add the beef mince. Season with pepper and mix together with your hands. 

Roll into even-sized balls, then shape into 1cm thick burgers, 1 per person. TIP: The burgers will shrink a little during cooking. IMPORTANT: Wash your hands and equipment after handling raw mince.


Pop the burgers onto a large baking tray. Bake on the middle shelf until cooked through, 12-15 mins. IMPORTANT: The burgers are cooked when no longer pink in the middle.

Meanwhile, halve, peel and thinly slice the onion.


Pop a large frying pan on medium heat and melt in the butter (see pantry for amount).

Once melted, add the onion, season with salt and pepper and fry, stirring occasionally, until golden, 10-12 mins. Add the sugar for the onions (see pantry for amount) and half the cider vinegar. Cook until caramelised, 1-2 mins more.

Meanwhile, in a medium bowl, combine the sugar and olive oil for the dressing (see pantry for both amounts) and the remaining cider vinegar. Season with salt and pepper, then set your dressing aside.

Grate the cheese. Halve the burger buns.


Once the burgers are cooked, carefully place the cheese on top of them and pop back into the oven until the cheese has melted, 2-3 mins.

At the same time, pop the buns into the oven to warm through, 2-3 mins.

In a small bowl, mix the remaining mustard with the mayo (see pantry for amount).

Just before everything's ready, toss the baby leaves in the dressing.


When everything's ready, spread the mustard mayo over the bun bases.
Top the bases with a cheesy burger and the caramelised onion, then sandwich shut with the bun lids.

Serve the fries and baby leaf salad alongside.