Maple, apple and walnut pots

Ingredients

• 25g butter
• 5 large Granny Smith apples, peeled, cored and cut into 1cm pieces
• 2 tbsp maple syrup, plus a little extra to serve
• 1 tbsp lemon juice
• 2 tsp castor sugar
• 1 cinnamon stick
• 1 1/2 cups walnuts
• 4 scoops good-quality vanilla ice-cream (use gluten-free if required)
• a few sprigs of chervil, to garnish