Shallot, Apple & Brie Tart

Ingredients

• 1 tbsp salted butter
• 6 round shallots, peeled and sliced
• 1 large garlic clove, crushed
• 5g fresh rosemary, finely chopped
• Sea salt & cracked black pepper
• 3 echalion shallots, peeled & cut in half
• 1 320g pack ready-made puff pastry
• 100g roule cheese
• 1 small apple, cored & sliced
• 100g brie, roughly chopped or sliced
• 1 egg
• 30g walnuts crumbled