Break lettuce into bite-size pieces by hand. Place in a colander, pour boiling water over the lettuce, and let it wilt.
Wrap the corn with the peel in plastic wrap and microwave it at 1200W for 1 minute 30 seconds (Cooking time depends on the wattage of your microwave.) When it is cool, peel the corn and shave off the kernels with a knife.
Dissolve miso with a small amount of dashi soup stock in a bowl. Then add the rest of the soup stock and milk to combine.
Place the lettuce (from step 1) and corn (from step 2) in a bowl. Pour the milk mixture (from step 3) over and sprinkle with ground sesame.