I saw this on TV long time back on a food show from Denmark. This simple pickled cucumber is so easy to make. You might search the web for accurate measurements but the below recipe worked fine for me. Make small quantities so that it tastes fresh and won’t go rancid.
Pickled Cucumber (Danish)
2 cups cucumber sliced thin on a mandolin
2 tbsp salt
½ cup vinegar
½ cup sugar
1 tsp crushed peppercorns or pepper powder
Mix salt and cucumber and keep for an hour.
Drain and wash the cucumbers in water. Squeeze well to drain excess water.
In a bowl stir sugar, vinegar and pepper till sugar dissolves. Add the cucumber to vinegar mixture.
It can be used after 1 hour. Keep the balance refrigerated.