Prepare the dressing by whisking together the ginger, sugar, lime juice, garlic and water. Refrigerate the dressing overnight.
See step-by-step photos below to assemble each of the four crab stacks by tightly layering together in a mold one fourth of each of the pea shoots, tomatoes, cucumbers, mango, onions, avocado and crab. (If you don't have a mold, you can use any hollowed-out aluminum can or circular bottle).
Press down on the top layer while slowly removing the mold to reveal the freestanding crab stack. Repeat with the remaining ingredients to form a total of four crab stacks.
Drizzle the crab stacks with the ginger-lime dressing and serve.
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