To a mixing bowl, add the mince, onion, garlic, oregano and feta. Season well with salt and pepper, then use your hands to combine all of the ingredients.
Divide the mixture into 4 equal parts, then roll in the palms of your hands to form a ball. Press down on the ball to flatten into a patty. Repeat with the other 3 and set aside.
For the tzatziki, grate the cucumbers then squeeze in your hands to get rid of the water. You can use normal cucumber, I just find the small snacking cucumbers to have a lot less water. To a small mixing bowl, add the yoghurt, cucumber, garlic, lemon juice, salt and pepper. Combine well and set aside.
Heat a pan with oil, then fry the patties for about 5 minutes each side until brown. Cook for an extra couple of minutes if you prefer your meat well-done. While the patties are cooking, you can toast your buns in a griddle pan.
Once buns and patties are done, assemble burger by placing lettuce on the bun, then top with the patty, tzatziki, slice of tomato, red onion and finish off with cucumber ribbons.
Serve immediately and enjoy!
