Soak clams in water for at least 15 min and then scrub any excess dirt off of them.
To make the sauce for the clams, start by melting butter in a pot over medium heat. When butter is melted, add in shallots, ginger, garlic, lemon grass, chilis salt and pepper.
Cook for about 3-5 min or until everything is super fragrant. Add in sake and let everything cook down for another 3 or so minutes. Turn off heat and add in lime juice. Season to taste.
Preheat grill to 450+ and then add clams. Grill until clams open up. Transfer to a plate, reserving as much of the clam juice as possible. Add sauce to each clam and sprinkle chopped cilantro and scallions overtop. Enjoy!