Leek and red pepper tart from Winter Food by Jill Norman

Ingredients

• 200g plain flour, plus extra for dusting
• 1 egg yolk, lightly beaten (optional)
• 3—4 tablespoons iced water (more if needed)
• 2 red peppers
• 30g butter
• 1 tablespoon olive oil
• 1 kg leeks, cut into 2cm slices, discarding most of the green
• 2 eggs
• 150ml crème fraîche
• salt
• freshly ground black pepper