Prepare edamame according to package directions, omitting salt.
Place edamame, 1/4 cup cashews, basil, and next 7 ingredients (basil through garlic) in a food processor; process 1 minute or until finely chopped.
With food processor on, slowly pour hot water through food chute; process 2 minutes or until smooth. Serve over soba, and sprinkle with 2 tablespoons cashews. Garnish with cilantro sprigs and lime wedges, if desired.