Saute the onions in the olive oil in a heavy pot until translucent.
Remove from pot and set aside. Add more oil to the pot if needed.
Over high heat, add half the meat and sear quickly, until slightly browned, and then remove, and set aside. Repeat with the remaining meat, but instead of removing it, add the other meat and onions back into the pot.
Make a space in the middle of the pot and add the flour. Continue to sauté for about 5 minutes, so that the flour is cooked and brown; then add enough water or stock to make a gravy, but not so much that it won’t all fit in the pie dish.
Add the bouillon/OXO cubes and salt (taste a little of the gravy so that you don’t oversalt it).
Simmer over low heat for 30 minutes or so, then remove from heat. Let cool slightly.
Place the bottom pie shell in a dish, and fill with the stew, then place the pastry on top. Brush with slightly beaten egg white and water.
Bake pie in crust, in preheated oven, near the bottom, at 400º F (200º C) for 30 minutes, then move the center of the oven for another 15 minutes or until golden brown.
Serve with gravy, mashed potatoes (made with butter and half and half) and peas.