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Preheat oven to 350 degrees.
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In a large mixing bowl, combine beef, egg, onion, lemon zest, parsley, salt, and pepper with your hands. Mix until just combined. Do not over mix. Form a loaf with the meat mixture in a baking dish (approx 9 x 13).
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Place in oven and on the shelf underneath the meatloaf, place a larger baking pan or roasting pan filled at least halfway with water. This will help prevent the meatloaf from cracking (although it still may crack a little on top). Not to worry if it does, the gravy will cover most of the cracks. Bake for 30 minutes.
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While the meatloaf is baking, prepare the gravy:
Boil 3 cups of water in a saucepan and when the water reaches a boil, place the bouillon cube in the saucepan to dissolve. Take 1 cup of the bouillon and water mixture and use it to baste the meatloaf during the cooking process. Reserve the other 2 cups.
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In a medium saucepan, heat olive oil on medium heat and saute mushrooms for 10 minutes or until they are softened and brown. Add lemon juice. Add the flour slowly and the remaining beef bouillon liquid. Stir until the gravy is thickened and smooth. Add salt and pepper. Taste and adjust seasonings as necessary.
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Remove meatloaf from oven and let rest for a few minutes, pour the mushroom gravy over the top. Garnish with extra parsley if desired.