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1
Put all of the patty ingredients into a bowl and mix together - I use my hands as I can break down the beef and make sure the flavors evenly combined
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2
Divide the mixture into 8 even sections
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3
Working with one section at a time, split it in 2 and on a wet surface (to keep the patties moist and moving freely), with wet hands press the 2 halves into thin patties about 3 inches in diameter
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4
Take a slice of cheese and fold in half, then in half again so you have a small square and place in the centre of one of the patties
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5
Cover with the other patty and work the edges together, shaping and sealing and ensuring that no cheese is showing
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6
Repeat until all 8 cheese filled patties are ready for frying
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7
Add to a hot frying pan or griddle and cook one side for 5 minutes, don't lift it, you want it to get a crust and seal in the juices
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8
Add the onions to the pan and allow to cook in the fat that comes out of the meat
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9
In a small bowl mix together the ketchup and soy sauce (and mayo if using)
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10
After 5 minutes cooking time carefully flip the patties and cook 5 minutes on other side.
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11
This is best done in an uncovered pan as the steam may loosen the patties allowing the cheese to burst out
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12
Slice buns, add patties fried onions and a spoonful of sauce - enjoy - snack sized patties for 8 or dinner for 4