I have made this version using the leek and cheddar combination a few times recently after picking up some lovely farmhouse cheddar whilst on holiday in Dorset. They're perfect for lunch or a light Spring supper accompanied by some English asparagus - especially in this gloriously hot and sunny weather!
60z plain flour
2-3floz cold water
a pinch of paprika (or cayenne) (optional)
a pinch of salt
For the filling:
2 medium leeks (trimmed, washed and sliced)
5floz mixture of milk and double cream (or just milk if you prefer)
4oz mature cheddar cheese (grated)
1 - 2oz butter
1 tsp mustard
salt & pepper
To make the filling, start by heating a large knob of butter (at least 1oz) in a heavy based pan over a low heat, then add the sliced leeks. Saute the leeks for around 10 minutes until softened but take care not to let them colour. In the meantime, beat the egg and add the milk and cream (or just milk), most of the grated cheese (keep a little to sprinkle on top of the tartlets), mustard a pinch of salt and plenty of freshly ground black pepper.
Remove the pastry from the fridge and roll out to line 4 greased fluted tarlet tins. Return the tins to the fridge for 10 minutes (or longer - they can be prepared in advance). Blind bake the pastry cases for around 15 minutes at approx 190 C (depending on your oven). To do this, line the pastry case with a piece of baking parchment and fill the parchment with baking beans (or rice or dried pulses). Then remove the parchment and baking beans and bake for another 5 minutes.
Divide the leeks between the part cooked tartlet pastry cases and then pour over the egg, milk and cheese mixture, taking care to make sure the cheese is equally divided between the tarlets. Sprinkle the remaining grated cheese on top and put back into the oven at approx 180 C (depending on your oven) for 10 - 12 minutes until set and golden.