450 g small new potatoes - 1 pound
60 g butter - 2.12 ounces
Two medium, sliced onions
Salt and pepper
500 g pack of ready-made shortcrust pastry - 17.64 ounces pie dough as an option, may not be as flaky
One jar of Hawkshead Relish Westmoreland Chutney
200 g Lancashire cheese or white cheddah - 7 ounces
One egg yolk