Clam and Scallion Pancakes (Jogae Pa Jon)

• 1 cup flour
• 1/4 cup rice flour
• 2 egg whites
• 1 cup water
• 1/2 cup fresh cherrystone clams, chopped
• 2 bunches scallions (white parts only), cut into batons
• 2 tablespoons serrano or green Thai-bird chilies, sliced
• 1/2 teaspoon salt
• 2 tablespoons oil

For the Sauce:

• 1/4 cup soy sauce
• 1 clove garlic, chopped
• 2 teaspoons chopped scallion
• 1 teaspoon toasted sesame seeds
• 1 teaspoon sesame oil
• 1 teaspoon vinegar
• 1/4 teaspoon black pepper