Bring a medium pot of water to a boil and add a generous pinch of salt. Add the edamame and cook until tender and bright green, about 5 minutes. Drain and cool under cold running water; drain again.
Transfer the edamame to the bowl of a food processor and add the coconut milk, scallion, ginger, lime juice, 4 teaspoons of the Sriracha, 1 teaspoon salt and 1/4 cup water. Process until you have a fairly smooth paste, about 1 minute. Taste the dip and add more salt and the remaining 2 teaspoons Sriracha if you like.
Serve immediately, or cover and refrigerate up to 1 day.
Transfer the dip to a serving bowl and top with a drizzle of Sriracha. Serve with rice crackers and assorted vegetables for dipping.
Edamame are firmer than most beans, and as a result they make a slightly chunky puree. If you prefer a dip with a very smooth texture, pass it through a sieve after pureeing it, using a spatula to work it through.
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