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Roast beef with sweet potato chips and aioli recipe image

Print Roast beef with sweet potato chips and aioli

This sumptuous meal in one baking tray is a good, easy beef dinner. You could also try other root veg in place of the sweet potato – parsnips, carrots and beets would all go well.


Beef recipes  


  • 1kg boneless sirloin
  • 1 tbsp grain mustard
  • Olive oil
  • 800g sweet potatoes, peeled
  • 1 sprig thyme
  • 2 garlic cloves
  • 4 tbsp mayonnaise
  • 1 tbsp fresh parsley, chopped
  • Salt & pepper


  1. Preheat oven to 230°C/Gas 8. Rub the beef with grain mustard and drizzle over a little olive oil, season and transfer to the very hot oven. After 20 minutes lower the temperature to 190°C/Gas 5 for the rest of the cooking time - see note.
  2. Cut the sweet potato into thick cut chips and surround the roast with them for the final 45 minutes of cooking - turning to coat with beef fat and seasoned with salt, pepper and a few thyme leaves, turning once more during cooking time.
  3. Rest the meat for 10 minutes before carving. Make aioli by crushing the garlic with some salt, squash to a creamy pulp and mix with the mayonnaise and parsley to serve with beef and chips.

Cooks notes

For rare beef, cook for 20 minutes per 500g, for medium 25 minutes per 500g, and for well-done 30 minutes per 500g, plus 15-20-minutes resting time.
want to cook with fresh ingredients? try one of our award winning veg boxes