Preheat oven to 180ºC/350ºF.
To make the pancake batter: Lightly beat the eggs in a large bowl. Add the milk. Gradually whisk in the flour and salt until you have a smooth batter. Whisk in 2 tablespoon oil. Set aside to rest for at least 20 minutes.
2 eggs, 568 ml /1pt milk, 125 g /4oz buckwheat flour, 125 g /4oz plain flour, pinch of salt, 2 tablespoon oil of your choice
When ready to cook your pancakes, heat a large frying pan, or crepe pan if you have one, over a medium-high heat. Heat a little oil or lard and add a ladleful of batter to the pan and swirl to cover the base. Be prepared that your first one is likely to be a dud! Cook for about a minute per side. Repeat until you have 4 or 8 pancakes, depending on how many you want to make.
oil or lard for frying
To make the filling: Heat ½ tablespoon oil in a frying pan. Lightly season the diced chicken breast with salt and pepper before adding to the pan. Fry until browned for 5 minutes or so. Remove to a bowl.
1 tablespoon olive oil, 2 chicken breast fillets
Add another ½ tablespoon oil to the pan along with 1 tablespoon butter. Add the sliced leeks along with a pinch of a salt. Cook over a medium heat for 5 minutes or until soft. Add back the chicken.
1 tablespoon butter, 2 leeks
Add the buckwheat flour to the chicken and leeks. Cook, stirring constantly, for a minute or two before adding the milk and chicken stock (or water) gradually to make a thick sauce. Stir in the wholegrain mustard and season to taste with salt and pepper.
2 tablespoon /30g buckwheat flour, 300 ml /1/2pt milk, 300 ml /1/2pt chicken stock or water, 4 teaspoon wholegrain mustard, salt and pepper
Lay out your pancakes. Divide the filling between them. You can either make 4 large ones and fold them in half or 8 smaller ones and fold into half and half again if you want a slightly more filling meal. Scatter a small amount of cheese inside before folding.
75 g extra mature cheddar
Oil a baking sheet and arrange your pancakes on it. Sprinkle the remaining cheese over the top. Bake for 20-25 minutes until golden and bubbling.