Flamiche de picardie

Ingredients

• Wholemeal pastry
• 125 gram wholemeal four
• 125 gram plain flour
• 115 gram butter, chopped
• 25 gram lard or butter (lard makes a lighter, flakier pastry)
• 1 egg yolk
• 2 tablespoon cold water
• Filling
• 500 gram leeks, trimmed
• 25 gram butter
• 2 tablespoon plain flour
• 3/4 cup milk
• 1/4 teaspoon ground mace (or nutmeg, but mace is more subtle)
• 1 egg, beaten
• Glaze
• saffron-infused milk (optional)