Pork Puff Pastry Roll

Ingredients

• 1 pork tenderloin (1 lb/0.5 kg)
• 6 slices prosciutto
• 1 pkg frozen rolled puff pastry sheets, thawed (454 g)
• 2 tbsp whole grain mustard
• 1 large egg, beaten
• 1 tsp chopped fresh thyme
• 1/2 tsp ground fennel
• 1/4 tsp freshly ground pepper