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Herby Dijon Roast Beef with Rosemary Potatoes

This Herby Dijon Roast Beef joint served with a zingy tarragon remoulade and herbed new potatoes is the perfect roast beef recipe for spring.

Prep Time

        Prep and cook time: hands-on time 40 minutes, plus resting, oven time 40 minutes
        Yield: Serves 6


    •    2 tbsps olive oil
    •    2 tbsps Dijon mustard
    •    3 tbsps chopped fresh parsley
    •    3 tbsps chopped fresh oregano
    •    1.2kg organic rolled beef sirloin, at room temperature
    •    4 tbsps finely chopped fresh rosemary leaves, plus a sprig
    •    1kg small waxy potatoes, such as charlotte or jersey royals

For the Remoulade:

    •    250ml sunflower oil
    •    1 tbsp crème fraîche
    •    1/2 tbsps Dijon mustard
    •    2 medium free-range egg yolks
    •    grated zest and juice 1/2 lemon
    •    3 tbsps finely chopped fresh tarragon
    •    2 tbsps capers, drained and rinsed, finely chopped
    •    50g cornichons in vinegar, drained (reserve 1 tbsp vinegar, finely chopped


  1. Heat the oven to 180ºC fan/gas 6. Put the potatoes in cold salted water, bring to the boil and simmer for 15-20 minutes. Drain, leave to cool a little, then peel while still hot. Leave to cool completely.
  2. Heat a dry frying pan with 1 tbsp oil. Pat the beef dry, sear it on all sides, then put on a baking tray. Season, then brush the mustard over the top and sides. Press half the herbs lightly onto the mustard, then roast for about 25 minutes for medium rare. Remove, cover with foil and rest for 10 minutes (the internal temperature after resting should be 55-60ºC; it will rise in temperature while resting).
  3. Meanwhile, for the remoulade, mix the yolks with the mustard and a pinch of salt. Whisk in 1 tbsp of the oil, drop by drop, until the mixture starts to thicken and emulsify, then whisk in the remaining oil in a thin trickle. Mix in the crème fraîche, cornichons, capers and cornichon vinegar. Stir in the tarragon, lemon zest and juice, then season. Cover and chill in the fridge (see Make Ahead).
  4. Heat the remaining 1 tbsp olive oil in the pan used to sear the beef, then stir-fry the potatoes for 8-10 minutes until crisp. Add the rosemary sprig after 6 minutes. Season.
  5. Sprinkle the remaining herbs over the meat, then serve with the potatoes, remoulade and your favourite seasonal greens.

This great family recipe is thanks to Delicious Magazine at


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