The school-lunch version uses Mie Prefecture pork, onion, chives, and seasonings mixed as filling, then wrapped in the 15 cm skin. The cooking is slow, low-temperature frying, so heat reaches the inside instead of only browning the surface. That process explains the two textures often associated with Tsu gyoza: a crisp, fragrant wrapper and juicy filling. The dish’s character comes from the connection between wrapper size, filling, oil temperature, and the school-lunch kitchen that had to cook for children at scale.