Detailed method of making the recipe Onion Jellyfish Coral Grass: 1. Wash and cut the purple onion and western lettuce into strips; wash the jellyfish skin and coral grass, then separate them; wash the small cucumber and slice it for later use. 2. Place all the ingredients from step 1 along with the green curly lettuce into ice water and soak for 2-3 minutes. Remove, drain, and place in a dish for later use. 3. Directly drizzle the commercially available Japanese mustard sauce over the dish from step 2 and it's ready to enjoy.