Potato and onion used in cheese & onion pasties

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In online recipes of cheese & onion pasties, they call for raw potato and onion mixed with grated cheddar cheese. I am wondering if the chopped potatoes and onions cook properly in the oven, don't we need to use sauteed onions and boiled potatoes?

Link to a sample recipe

Best Answer

The raw potato will definitely cook through. If you cooked the potatoes first, they would be almost devoid of texture by the time they cooked a second time in the oven - you'd have something more akin to mashed-potato pastries on your hands.

You might want to think about sweating the onions first, though. Sweating them would drive-off some of their moisture and would mellow the taste of your pastry filling. Definitely not a requirement, but I think you'd prevent soggy pastry bottoms and serve-up a better tasting treat.

Also, your recipe throws-out the notion of brushing the pastry tops with milk or egg like they are interchangeable. Milk is traditionally used to soften the the crusts of breads - an egg wash will give your pastries a rich brown top. I have never seen a puff pastry recipe that called for a milk wash. Stick with the egg wash - beat a large egg with 1 Tbsp. water and brush the tops of your pastries lightly before parking them in the oven.