In a bowl, combine the mayonnaise, onion and mustard. In another bowl, combine the crackers and sesame seeds. Cut the chicken lengthwise into 1/4-inch strips. Dip the strips into mayonnaise mixture, then into the sesame seed mixture.
Place in a single layer on a large greased baking sheet. Bake at 425 degrees for 15-18 minutes or until the juices run clear. Combine the sauce ingredients and serve with the chicken strips.
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