Make the basil coconut sauce: In a food processor, combine the coconut milk, basil, cashew butter, lime juice, chiles, garlic, ginger, and salt. Pulse until well combined. Season to taste.

Assemble the summer rolls: Fill a shallow glass baking dish with 1-inch of warm water. Submerge one rice paper in the warm water for 7 seconds and then lay the softened wrapper on a clean, damp kitchen towel. Place desired fillings into the center of the wrapper. Fold the bottom of the wrapper over the filling and gently tuck the filling under the wrapper. Fold the sides over the filling. Then continue rolling and tucking the rice paper to form a summer roll. Repeat with the remaining rice papers.

Serve with the Basil Coconut Sauce for dipping. Serve with tamari and sriracha on the side, if desired.