Clean the iceberg lettuce and cut or tear into pieces. Clean and wash the peppers and cut into small diamonds. Wash the tomatoes, remove the stem, quarter and cut into pieces. Peel the cucumber with the garnish peeler, quarter it and cut into pieces. Clean, wash, halve and slice the radishes. Clean and wash the spring onions and cut into rings. Cut the feta cheese into small cubes. Put all the ingredients (pieces of iceberg lettuce, peppers, pieces of tomato, cucumber, radish slices, spring onion rings and feta cheese cubes) in a bowl and mix carefully.