Whisk together flour, salt, and water. Let batter rest overnight.
In a large skillet, heat one teaspoon oil. Add enough batter to thinly coat the bottom of pan, tilting to ensure full coverage. When sides of crepe start to pull away from edges, pour one whisked egg over surface, spreading to edges. Top with sesame seeds and cilantro.
Carefully flip crepe and spread one heaping tablespoon of the Hoisin mixture across the surface. Top with four wontons, 1/4 cup green onions, 1/4 cup pork, and 1/4 cup cabbage.
Fold rounded edges of crepe inward to form a square, like a letter. Cut in half and repeat three more times.