Soak dried shrimp in hot boiling water in a small bowl for 5 minutes. Alternatively, you can boil the dried shrimp for 3 minutes. Drain and transfer to a stone mortar.
Pound with a pestle until the shrimp are all smashed. Dried shrimp can also be coarsely chopped on the cutting board. Set aside.
Peel cucumber with a vegetable peeler. Cut into quarters lengthwise. Cut off the entire strip of seeds.
Then cut cucumber strips at a diagonal into ¼ inch thick slices.
Mix cucumber with 1 tsp salt in a bowl for 20 minutes to draw out the juices. Rinse and drain.
Place cucumber, shallots, and prepared dried shrimp in a large bowl.