Roasted Beef With Mustard Potatoes | Beef Recipes | Tesco Real Food

Ingredients

• 3 leeks (about 500g), trimmed, halved lengthways, then quartered
• 4 carrots (about 300g), trimmed and halved lengthways
• 2 tbsp Dijon mustard
• 2 tbsp light brown sugar
• 1.4kg beef roasting joint (we used topside)
• ½ beef stock cube, made up to 250ml
• 1.2kg Tesco Finest all-rounder potatoes, peeled and halved, or quartered if large
• 1 tbsp plain flour
• 2 tbsp English mustard powder
• 10g thyme sprigs plus extra to serve
• 1½ tbsp olive oil