Peel, halve and core the cucumber. Slice into a bowl with a cucumber slicer and mix with a little salt. Let rest for 5 minutes.
Cut the bell pepper into small cubes, thinly slice the spring onions and olives and add both to the bowl.
Mix with Greek yogurt, a little lemon juice, olive oil, balsamic vinegar and a crushed clove of garlic. Season with salt and pepper and serve sprinkled with freshly chopped dill.