21.   Do not let the mixture boil.

22.   If mixture boils too quickly, volume will be reduced too much and the resulting syrup will be too thick.

23.   Place over medium heat and stir until all ingredients are blended together and mixture boils.

24.   Stir-fry until mixture boils and thickens slightly.

25.   Stir steadily, but slowly, until the mixture boils.

26.   Turn heat on and adjust it so that mixture boils energetically but not violently.

27.   When mixture boils, turn heat to low, and cover.

28.   Whisk in cornstarch mixture and cook, whisking, until mixture boils and thickens.

29.   Stir over low heat until mixture boils and thickens.