Toast the buns before frying the patties by very lightly buttering both sides of the bun and placing in a dry, hot skillet. Carefully monitor the toasting. It usually takes 30 to 60 seconds to toast depending on the temperature of the skillet.
Mix all the ingredients well in a medium sized bowl, then form into 4 patties. (Or patty size of your choice).
Add vegetable oil to heavy skillet about 1/4" depth and heat on high until the oil is 350° to 375°.
Lower the heat slightly and carefully add the patties to the oil and fry the first side until nicely browned, 2 to 2 1/2 minutes.
Carefully turn the patties over and brown the second side, 2 to 2 1/2 minutes.
Remove from the skillet and place on a paper towel lined plate. Assemble the sandwiches.