Peel and wash the potatoes, slice them into very fine slices (1-2 mm) and put them in cold water. Clean, wash and roughly grate the cucumber. Peel garlic and cut into fine cubes. Mix garlic, cucumber and yoghurt, season with salt, pepper, lemon juice and sugar. Drain olives and chop finely. Wash sage, dab dry, put four stems aside.
Pluck remaining leaves from the stems and chop finely. Knead minced meat with egg, breadcrumbs, ketchup, sage and olives. Season to taste with salt and pepper. Halve goat cheese and cut into 16 slices. Form 16 longish meatballs out of the minced mass and put a strip of goat cheese in the middle of each. Heat two tablespoons of olive oil in a coated frying pan, fry the meatballs for ten minutes on a medium heat. In the meantime, drain the potatoes. Heat the oil in a saucepan. Fry the potato slices in portions for four minutes until golden brown. Remove potatoes, drain on kitchen paper and season with salt. Sprinkle Tzaziki with a teaspoon of olive oil. Drain the bifteki on kitchen paper.
In the meantime, drain the potatoes. Heat the oil in a saucepan. Fry the potato slices in portions for four minutes until golden brown. Remove potatoes, drain on kitchen paper and season with salt. Sprinkle Tzaziki with a teaspoon of olive oil. Drain the bifteki on kitchen paper. Arrange potato chips and bifteki on plates, garnish with sage and lemon wedges. Add tzatsiki