Follow the cooking instructions on the sea cucumber package. The one I purchased was pre-cooked and only required that I boil the sea cucumbers for 5 minutes. We want a slightly chewy texture, not too soft so do not overcook.
Remove the sea cucumbers from the water and let cool
Rinse the jellyfish with water and drain
Slice the cucumbers to suit your liking. I peeled mine, cut it in half vertically and then sliced
Slice the cooled sea cucumbers horizontally into small slices
Mix the jellyfish and sea cucumbers together
Chop garlic and chilis
Combine 2 tbsp Zhejiang vinegar, 1 tbsp rice vinegar, 3 tbsp Mirin, 1 tbsp light soy sauce, 1 tbsp oyster sauce, 1 tsp salt, ½ tsp Sichuan peppercorn powder, 1 tbsp sesame oil, chopped garlic and chopped chilis. Mix together
Place the cucumbers on the bottom of a serving plate
Add the jellyfish and sea cucumbers on top of the cucumbers
Pour the sauce mixture over top
Serve