Roast beef with thyme and fennel crust

Ingredients

• 1 1/2 cups fresh whole-wheat breadcrumbs
• 1 tbsp fennel seeds
• 6 large sprigs fresh thyme
• 1/4 cup olive oil
• 2 tbsp low-fat milk
• 1 1/4 kg beef round roast (trimmed of all excess fat)
• 1 tbsp whole grain mustard
• 1 celeriac (peeled)
• 2 orange sweet potatoes (peeled)
• 4 carrots (peeled)
• 300 g shallots (peeled)
• 7 tbsp medium sweet sherry (Madeira or port)
• 1 1/4 cups water