Roast beef sirloin & béarnaise dauphinoise served on a plate

Roast beef sirloin & béarnaise dauphinoise

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Prep: 45 mins Cook: 1 hr, 35 mins plus resting and infusing

More effort

Serves 10

Wow guests with an intensely flavoursome, peppered sirloin joint. Serve alongside our potatoes dauphinoise, enriched with tarragon, shallots and gruyère 

Nutrition and extra info

  • Gluten-free

Nutrition: Per serving

  • kcal859
  • fat61g
  • saturates31g
  • carbs26g
  • sugars7g
  • fibre5g
  • protein49g
  • salt1.4g
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Ingredients

  • 2kg boneless beef sirloin, tied
  • 2 tbsp olive oil
    olive oil

    Olive oil

    ol-iv oyl

    Probably the most widely-used oil in cooking, olive oil is pressed from fresh olives. It's…

  • ½ tbsp black peppercorns
  • ½ tbsp sea salt
  • 1 large garlic bulb
  • 450g baby carrots, halved
    Carrot

    Carrot

    ka-rot

    The carrot, with its distinctive bright orange colour, is one of the most versatile root…

  • 200g watercress
    Watercress

    Watercress

    wort-er-cress

    With deep green leaves, and crisp, paler stems, watercress is related to mustard and is one of…

For the dressing

  • 5 tbsp olive oil
    olive oil

    Olive oil

    ol-iv oyl

    Probably the most widely-used oil in cooking, olive oil is pressed from fresh olives. It's…

  • 2 tbsp cider vinegar
  • 1 tbsp Dijon mustard
  • ½ tsp caster sugar

For the dauphinoise

  • 40g unsalted butter, plus extra for the dish
    Butter

    Butter

    butt-err

    Butter is a dairy product made from separating whole milk or cream into fat and…

  • 3 banana shallots, finely chopped
  • 70ml white wine vinegar
  • 500ml double cream
  • 500ml whole milk

    Milk

    mill-k

    One of the most widely used ingredients, milk is often referred to as a 'complete' food…

  • 3 large garlic cloves, bashed
  • small bunch of tarragon, leaves finely chopped, stalks reserved
    Tarragon

    Tarragon

    ta-ra-gon

    A popular and versatile herb, tarragon has an intense flavour that's a unique mix of sweet…

  • 1 large egg yolk (freeze the white for another recipe)
  • 1½ kg King Edward potatoes, thinly sliced
    Potato

    Potato

    po-tate-oh

    The world's favourite root vegetable, the potato comes in innumerable varieties. A member of…

  • 70g gruyère, grated
    Gruyère

    Gruyère

    groo-ee-yeah

    Gruyère is an undoubted pinnacle of traditional Swiss cheese-making, a culinary masterpiece as…

Method

  1. Leave the beef at room temperature for 1 hr before cooking. For the dauphinoise, heat the butter in a saucepan over a medium heat. Once foaming, add the shallots and a pinch of salt and fry for 10 mins or until softened. Add the vinegar and reduce it by half, then pour in the cream and milk. Tip in the garlic and tarragon stalks and bring to a simmer. Take off the heat and set aside to infuse for 30 mins.

  2. Tip the mixture into a bowl, scoop out the garlic and tarragon stalks, and discard. Whisk through most of the chopped tarragon, the egg yolk and some seasoning. Mix the potato slices through the infused cream until they are fully coated, then arrange in overlapping layers in a buttered 30cm round dish. Pour over any remaining liquid, scatter with the gruyère and set aside.

  3. Heat the oven to 220C/200C fan/gas 7. Heat the olive oil in a large non-stick pan over a high heat. Add the beef and fry for 5-7 mins, on all sides, until the fat is golden brown. Remove and put in a roasting tin. Bash the peppercorns and salt together with a pestle and mortar, and rub this over the fatty parts of the meat. Cut the garlic bulb in half through the cloves, then add to the tin.

  4. Turn the oven down to 180C/160C fan/gas 4. Put the beef in the oven to cook for 55 mins-1 hr 5 mins (for medium-rare). Put the dauphinoise on the lower shelf to cook for the same amount of time, then add the carrots to the roasting tin for the last 25 mins. A cooking thermometer should read 55C when the beef is cooked. Cover with foil and leave to rest for 25 mins.

  5. Make the dressing by whisking all the ingredients together with some seasoning, then toss with the watercress. Serve the beef thinly sliced with the dauphinoise, carrots, the roasted garlic and the lightly dressed watercress leaves.

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