Place chicken tenderloins on a microwave-safe plate and sprinkle 1 tsp cooking sake over the tenderloins. Cover the plate with plastic wrap and microwave it for 1 minute 30 seconds (Cooking time depends on the wattage of your microwave. This recipe is based on a 1200W microwave.) Let it cool.
When the tenderloins are cool, remove the tendons and break the tenderloins into big pieces by hand. Wash the apple and cut it into triangles0.4 inches thick with the peel.
Mix <A> in a bowl and add the tenderloins and apples into the bowl. Serve it on top of pieces of butterhead lettuce on a plate.