Sprinkle chicken with salt and sherry and marinate for 15 minutes.While chicken is marinating, prepare the sauce. Mix together the cornstarch and water in a small saucepan until smooth. Gradually mix in the chicken broth, mushrooms,soy sauce, butter and boullion granules. Bring mixture to a boil, stirring constantly. Let boil for 1 minute, and keep warm.To prepare batter: Beat together the cornstarch, flour, baking powder, egg and water until smooth. Coat each piece of chicken with the batter. Heat large skillet or wok and add oil to a depth of 1/2 inch. Heat to 375 degrees. Cook coated chicken pieces in oil until they are golden brown, turning once. This should take about 5-7 minutes. Drain the chicken on a tempura rack if you have one or on a paper towel. Cut the fried chicken in diagonal strips. Reassemble the strips into a chicken breast shape and place on a bed of shredded lettuce. Sprinkle with toasted almonds and green onions. Spoon the sauce over the chicken and serve.