ASIAN Slaw: Saute onions in combined vinegar and sugar in large skillet about 5 min. or until tender. Add remaining ingredients; mix well.
ASIAN-GLAZED Turkey: Beat all ingredients except turkey in large skillet with wire whisk until well blended. Remove half of the glaze; pour into saucepan. Cook until heated through. Meanwhile, add turkey to remaining glaze in skillet; cook 5 to 10 min. or until heated through, stirring occasionally.
MIX mayonnaise and sriracha sauce.
FOR each serving:
Toast 2 bread slices; spread evenly with 1 Tbsp. of the mayonnaise mixture. Top 1 of the toast slices with 1/2 cup of the Asian-Glazed Turkey, 1/2 cup Asian Slaw and remaining toast slice. Serve with about 3 Tbsp. of the heated glaze for dipping.