Ultimate roast beef sandwich

Ingredients

  • 55 g unsalted butter, softened
  • 4 slices of crusty white bread
  • 2 tbsp English mustard
  • 300 g roast beef, thinly cut
  • watercress, to serve
For the horseradish sauce:

  • 150 ml double cream, lightly whipped
  • 150 ml mayonnaise
  • 85 g horseradish, freshly grated
  • 2 tbsp English mustard
  • dashes of Worcestershire sauce
  • 1 tbsp lemon juice
  • pinch of sugar
  • salt, and freshly ground black pepper
For the caramelised leek:

  • 15 g unsalted butter
  • 2 leeks, washed and thinly sliced
  • 2 tbsp muscovado sugar
  • 2 tbsp dry white wine
For the potatoes:

  • 50 g butter
  • 2 large potatoes, cubed

Description

Antony Worrall Thompson Combines Roast Beef With Tangy Horseradish Sauce, Caramelised Leek And Crisp Fried Potatoes In This Ultimate Roast Beef Sandwich

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