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21 Day Aged Fillet and Caramelised Onion Baguette

21 Day Aged Fillet and Caramelised Onion Baguette

Serves 2 | with Cheddar and Roasted Garlic Mayo
4.0(4)
Recipe Development Team
Recipe Development TeamUpdated on April 02, 2026
Calories
780 kcal
Protein
51.6g protein
Total
30 minutes
Difficulty
Easy
Allergens:
  • Cereals containing gluten
  • Oats
  • Rye
  • Soya
  • Wheat
  • Barley
  • Milk
  • Egg
  • Mustard
  • Nuts
  • Sesame
  • Walnuts
  • Lupin
  • Milk
  • May contain traces of allergens
Produced in a facility that processes eggs, milk, fish, peanuts, sesame, shellfish, soy, tree nuts, and wheat.
serving amount

2 unit(s)

21 Day Aged British Fillet Steaks

1 unit(s)

Onion

3 unit(s)

Garlic Clove

1 unit(s)

SlooOW Stone Oven White Baguette

(Contains: Cereals containing gluten, Oats, Rye, Soya, Wheat, Barley May contain traces of: Nuts, Sesame, Walnuts, Lupin, Milk)

60 grams

Mature Cheddar Cheese

(Contains: Milk May contain traces of: Milk)

64 grams

Mayonnaise

(Contains: Egg, Mustard)

20 grams

Wild Rocket

Not included in your delivery

½ tsp

Sugar

Energy (kJ)3264 kJ
Energy (kcal)780 kcal
Fat31.9 g
of which saturates11.9 g
Carbohydrate71 g
of which sugars10.7 g
Dietary Fibre6.3 g
Protein51.6 g
Cholesterol91.5 mg
Salt2.6 g
Potassium661.7 mg
Calcium270.3 mg
Iron3.6 mg
Always refer to the product label for the most accurate ingredient and allergen information.
Baking Tray
Large Frying Pan
Pan
Bowl

Instructions

Caramelise the Onion
1

a) Preheat your oven to 220°C/200°C fan/gas mark 7. Remove the steaks from your fridge to allow them to come up to room temperature

b) Halve, peel and thinly slice the onion. Heat a drizzle of oil in a large frying pan on medium heat. Once hot, add the onion, season with salt and pepper and fry, stirring occasionally, until golden, 10-12 mins. 

c) Meanwhile, pop the garlic (unpeeled) into a small piece of foil with a drizzle of oil and scrunch to enclose it.

Bake the Bread and Garlic
2

a) Remove the bread from the packaging and pop onto a baking tray along with the garlic parcel.

b) Bake on the top shelf until the bread is toasted and golden and the garlic has softened, 10-12 mins.

c) Once the onion has softened, add the sugar (see pantry for amount) and cook until caramelised, 1-2 mins more.

d) Once caramelised, remove the onion from the pan into a small bowl. Keep the pan for the next step.

Fry the Steaks
3

a) Heat a drizzle of oil in the (now empty) onion frying pan on high heat. Season the steaks with salt and pepper.

b) Once the oil is hot, lay the steaks into the pan and fry until browned, 1-2 mins on each side. Lower the heat to medium and cook for another 2-3 mins on each side for medium-rare. TIP: Cook for 1-2 mins extra on each side if you like it more well done. IMPORTANT: Wash your hands and equipment after handling raw meat. The steak is safe to eat when browned on the outside.

Slice and Grate
4

a) Once the steaks are cooked, transfer to a board, cover and allow to rest for a couple of mins, then cut into bite-sized pieces.

b) While the steaks rest, grate the cheese. 

c) Once the bread is baked, allow to cool for 5 mins, then slice it in half lengthways and again widthways.

Make the Garlic Mayo
5

a) Once the garlic has cooled, cut the end with scissors, squeeze it out of the skin and mash with a fork.

b) In a small bowl, mix together the garlic and mayo, then season with salt and pepper.

c) Spread the roasted garlic mayo over the lids and bases of the baguette halves.

Build Your Sandwiches
6

a) Top each base with the caramelised onion, followed by the steak.

b) Arrange the cheese on top of the steak and, if you'd like to, pop it back into the oven until the cheese has melted, 2-3 mins.

c) Top the cheese with the rocket, then finish with the baguette lids. Share between 2 serving plates.

Enjoy!

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