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21 Day Aged Sirloin Steak in Garlic Butter Sauce

21 Day Aged Sirloin Steak in Garlic Butter Sauce

with Dauphinoise Potatoes, Roasted Tomatoes and Tenderstem®
Anushka Magan
Anushka MaganUpdated on November 02, 2026
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Calories
: 
1047 kcal
Protein
: 
57.3g protein
Total
: 
45 minutes
Difficulty
: 
Easy
Allergens:
  • Milk
  • Egg
  • Sulphites

Looking for a taste of everyday luxury? This Lamb Steak in Garlic Butter Sauce is our best ever version, with premium ingredients for an extra special twist on a classic recipe.

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 Sirloin Steaks

450 grams

Potatoes

1 unit(s)

Echalion Shallot

1 bunch(es)

Flat Leaf Parsley

3 unit(s)

Garlic Clove

160 grams

Tenderstem® Broccoli

125 grams

Baby Plum Tomatoes

150 grams

Creme Fraiche

(Contains: Milk)

20 grams

Chicken Stock Paste

40 grams

Grated Hard Italian Style Cheese

(Contains: Milk, Egg)

15 milliliter(s)

Cider Vinegar

(Contains: Sulphites)

30 grams

Unsalted Butter

(Contains: Milk)

Not included in your delivery

50 milliliter(s)

Water for the Dauphinoise

100 milliliter(s)

Water for the Sauce

Energy (kJ)4379 kJ
Energy (kcal)1047 kcal
Fat67.5 g
of which saturates37.8 g
Carbohydrate57.7 g
of which sugars9.8 g
Dietary Fibre9.5 g
Protein57.3 g
Salt3 g
Potassium1571.3 mg
Calcium76.8 mg
Iron2.4 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.
•Chopping Board
•Baking Tray
•Garlic Press
•Knife
•Large Saucepan
•Colander
•Oven dish
•Large Frying Pan
•Aluminum Foil

Cooking Steps

Get Prepped
1

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.

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 chop the shallot into small pieces.

Roughly chop the parsley (stalks and all). Peel and grate the garlic (or use a garlic press).

Boil the Potatoes
2

Once boiling, add the potato slices to the water and simmer until just tender, 8-12 mins. Once cooked, carefully drain in a colander.

Meanwhile, halve any thick broccoli stems lengthways and pop onto a large baking tray. Drizzle with oil, season with salt and pepper, then toss to coat. 

Add the tomatoes to the other side of the tray. Drizzle with oil, season with salt and pepper, then toss to coat. Set aside for now.

Make the Dauphinoise
3

Next, heat a drizzle of oil in a large frying pan on medium heat. Once hot, add half the garlic and cook until fragrant, 30 secs. Add the creme fraiche, water for the dauphinoise (see pantry for amount), half the chicken stock paste and half the Italian style cheese.

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

Lay the cooked potato slices in layers in an appropriately sized ovenproof dish, then pour over the creamy sauce. Sprinkle the remaining cheese on top.

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.

Fry the Steaks
4

Wipe out the (now empty) frying pan and return to high heat with a drizzle of oil. Season the steaks with salt and pepper.

At the same time, put the broccoli and tomato tray onto the middle shelf to roast until tender and crispy, 10-12 mins.

Once the oil is hot, lay the steaks into the pan and fry until browned, 1 min on each side. Lower the heat slightly and cook for another 1-2 mins on each side if you want them medium-rare. TIP: Cook for 1-2 mins more if you like it more well done. 

Make the Butter Sauce
5

Once cooked, transfer to a board, cover with foil and allow to rest for a couple of mins. IMPORTANT: Wash your hands and equipment after handling raw meat. The steak is safe to eat when browned on the outside. Return the (now empty) frying pan back to medium heat with a drizzle of oil.

Once hot, add the shallot and cook until softened, 4-5 mins, then add the remaining garlic and cook for 30 secs more.

Pour in the cider vinegar and allow it to evaporate. Stir in the water for the sauce (see pantry for amount) and remaining chicken stock paste. Bring to the boil, then lower the heat and simmer for 2-3 mins. 

Stir in the butter until melted. Simmer until thickened, 1-2 mins more, then remove from the heat and stir through the parsley. 

Slice and Serve
6

When everything's ready, thinly slice the steaks and transfer to your plates. Spoon over the garlic butter sauce. 

Serve the dauphinoise potatoes, roasted broccoli and tomatoes alongside.

Enjoy! 

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