Root vegetable gratin | Tesco Real Food

Ingredients

• 20g butter, plus extra to grease
• 1 echalion shallot, finely chopped
• 150ml vegetable stock
• 150ml double cream
• 4 fresh thyme sprigs, leaves picked or 1 tsp dried thyme
• ¼ tsp ground nutmeg
• 1 large garlic clove, finely sliced
• 3 large parsnips, peeled and thinly sliced into rounds
• 3 medium sweet potatoes, peeled and thinly sliced into rounds
• 3 Maris Piper potatoes, peeled and thinly sliced into rounds
• 20g Tesco Finest Reserve Swiss Gruyère, finely grated
• green salad and cornichons, to serve