Dry the 1 boneless skinless chicken breast with a paper towel and then coat with the ½ teaspoon ginger. Mix the 1 teaspoon evaporated cane sugar and ½ teaspoon salt in a small bowl and sprinkle on both sides of the chicken.
1 boneless skinless chicken breast, ½ teaspoon ginger, 1 teaspoon evaporated cane sugar, ½ teaspoon salt
Place the chicken in a vacuum bag and seal. It's best to let the chicken marinate overnight but you can also cook it right away.
Heat a water bath to 140 degrees F (60 C). Drop the bagged chicken in the water and cook sous vide for 1 hour 30 minutes.
When the chicken is done, remove it from the bag, dry the surface with a paper towel, and place the chicken on a heatproof surface.
In a small saucepan, combine the remaining 2 tablespoons evaporated cane sugar, 2 tablespoons soy sauce, and 2 tablespoons sake. Bring to a boil and boil until the sauce is thick, forming large shiny bubbles.
2 tablespoons evaporated cane sugar, 2 tablespoons soy sauce, 2 tablespoons sake
Drizzle half the sauce onto the chicken and quickly torch the glaze until it has caramelized into a rich mahogany color. If you don't have a torch, you can put the chicken directly under the heating element of a broiler set to high.
Slice the chicken and drizzle with the remaining sauce.