In a small saucepan, combine the sherry, soy sauce, brown sugar, sesame oil, garlic and ginger. Bring to a boil, reduce heat and simmer for 2 to 3 minutes until the sugar dissolves. Remove from heat and let cool for 10 minutes. Place chicken breasts in a resealable plastic bag. Pour half of the sherry sauce over the chicken. Seal the bag and refrigerate for 30 minutes. Use the other half of the sauce for stir-frying the vegetables and for serving.
TIP: Don’t worry about serving this sherry sauce to the kids. The alcohol burns off during cooking.