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1
Chop all of the vegetables.
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2
Combine turkey, Worcestershire, onion, and mushrooms in a large bowl.
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3
Add egg and bread crumbs and mix to combine.
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4
If you think the mixture looks too wet, you either need to mix it up some more (using your hands works best), or add a few more sprinkles of bread crumbs.
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5
Next, add half of a 5 ounce feta cheese package to the mix as well as all of the seasonings.
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6
Be generous with the seasoning, really, you can never over-season.
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7
Form mixture into patties.
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8
You should be able to get 4-6 patties depending on the size you prefer to make them.
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9
Cook in a frying pan on medium heat until the outside is browned and the juices run clear, about 4-6 minutes per side at least.
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10
At the same time, saute the onion slices in olive oil over medium heat for about 6 minutes and add them to the top of your burger.
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11
Warm the olive oil on medium heat before adding in your onions and starting the time.
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12
Be sure to move the onions around constantly.
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13
Combine the ingredients for the Greek cucumber sauce.
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14
Feel free to adjust seasonings to your individual tastes.
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15
If you prefer, you can substitute ketchup and mustard for the sauce.
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16
Put the onion topped burger on a bun, top with your sauce of choice and enjoy.
