Support your favorite local craft beer; it will match this rustic burger very well!
Wash and slice tomato and cucumber.
Add ground beef, Dijon mustard, and ketchup to a mixing bowl. Season with salt and pepper and mix together until combined. Divide in half and form two burger patties with your hands.
Heat oil in a pan for approx. 2 min. and fry burger patties on both sides over medium-high heat for approx. 4 min., or until cooked to desired doneness.
With the help of a cake ring, cut out two circles approx. the size of the burger patties from each slice of bread. They will be used as buns later. Heat oil in a frying pan over medium-high heat and toast bread on both sides for approx. 2 min., or until crisp.
Top rye bread slices with mayonnaise, burger patties, and slices of tomato and cucumber. Enjoy!