Broccoli and three cheese pie

Ingredients

• Gluten-free pasty
• 2 cups gluten-free flour, plus extra for dusting
• Big pinch of salt
• 150 g butter, chilled
• 1 egg, mixed with 2 tbsp cold water
• Filling
• 1/2 cup sour cream
• 100 g goat's cheese
• 1/4 tsp chilli flakes
• 2 tbsp store-bought pesto
• 1 head broccoli, steamed whole for 2 minutes
• 100 g mozzarella, grated
• 1 tsp lemon zest
• 2-3 tbsp olive oil
• 75 g feta
• Black pepper, to season