Plaited loaves with crumble topping baked in a cast iron pot

Crumble topping

• 30 g plain flour
• 20 g sugar
• 25 g unsalted butter, cut into pieces

Dough

• 2 eggs, 1 beaten
• 2 egg yolks
• 100 g unsalted butter, cut into pieces, plus extra to serve
• 50 g sugar
• 1 tsp vanilla sugar (see Tip)
• 2 tsp dried instant yeast
• 150 g milk
• 500 g plain flour, plus extra to dust
• 1 tsp sea salt
• oil, to grease
• jam, of choice, to serve