Mary Berry Leek and Potato Gratin Recipe 🥔

Ingredients

• 1 kg (2.2 lb) of potatoes, peeled and thinly sliced
• 3 large leeks, trimmed and sliced
• 50 g (1.8 oz) of butter
• 150 ml (5 fl oz) of chicken stock
• 300 ml (10 fl oz) of double cream
• 100 g (3.5 oz) of grated cheddar cheese
• Salt and pepper, to taste
• Fresh parsley, chopped, for garnish (optional)