Mackerel, saffron, fennel and cauliflower pie recipe

Ingredients

• 4 fillets of mackerel
• 2 bulbs of fennel
• 60g butter
• 1 cauliflower
• 1 tsp fennel seeds
• 3 spring onions, sliced
• 2g saffron (a large pinch)
• 2 level tbsp flour
• 260ml whole/semi-skimmed milk
• 100ml double cream
• 2 tbsp white wine
• 1 x 400g tin of tomatoes
• 1 small egg, beaten
• 300g puff pastry
• Flour, for dusting