Saute onions until translucent, add garlic, cook until aromatic (30-60 sec)
Add beef and brown, turn off saute mode once done
Throw in the mushrooms
Pour in stout, beef stock, salt, pepper & Worcestershire sauce, mix and ensure everything is covered
Pressure cook, 20 mins, high pressure, 10 min natural release
Open lid carefully & turn on Saute mode
Mix corn flour & water, add gradually to the pan, stirring well (You probably won't need it all), thicken to desired consistency
Add any additional salt & pepper to taste
Spoon your filling into appropriately sized bowls/ramekin
Slice the sheet of puff pastry to fit your bowls/ramekin and place over the top and seal,
Stab the centre of the pastry with a knife
Brush the pastry with egg and bake for 18-22 minutes until the pastry is puffed and golden brown.
Remove from oven and allow to stand for ~10 mins to cool slightly
Serve