Remove the strings from the snap peas. Tear the green leaf lettuce into bite-sized pieces.

Boil water in a pot, add the snap peas, and blanch briefly. Transfer to cold water to cool.

Bring the same pot of water to a boil again, add 1 tbsp of sake (optional), and reduce to low heat. Cook the pork slices one by one until their color changes. Remove and let cool.