SAUCE1. In a large saucepan, mix soy sauce, sugar, and water. 2. To a blender or food processor, add ginger, garlic, apple, celery, onion, parsley, and lettuce. Puree until smooth. Add to pan with soy sauce mixture.3. Bring sauce to boil, reduce to simmer. Simmer for at least 30 minutes, stirring occasionally, until sauce reduces and is slightly syrupy. 4. Mix cornstarch and water in a small bowl and add to sauce. Bring sauce to boil and stir constantly for a few minutes until sauce thickens.Take off heat and cool.CHICKEN5. Marinate chicken in about 1/2 cup of the sauce for at least an hour (in a ziploc bag in the fridge). 6. Grill chicken on high heat until cooked through. Let sit for 10 minutes, then slice into thin strips (against the grain on a bias).ASSEMBLY7. Serve sliced chicken next to a bed of rice. Pour sauce over chicken (and rice if you want). Add salad and dressing to plate. Eat all together and enjoy! Warning: This stuff is addicting. :) Adapted from recipe found at nakedsoapmanmusings.blogspot.com/2011/01/authentic-seattle-teriyaki.html