11.   Cook over medium heat until mixture comes to a good boil.

12.   Cook over medium heat, stirring, until the mixture just comes to a boil, then remove from heat.

13.   Cook over medium heat, stirring constantly, until mixture comes to a boil.

14.   Cook over medium-high heat, stirring constantly, until mixture comes to a boil.

15.   Cook and stir over medium heat just until mixture comes to a boil.

16.   Cook over medium heat, stirring constantly until sugar dissolves and mixture comes to a boil.

17.   Cook over medium heat, stirring constantly, until the mixture comes to a boil.

18.   Cook over medium heat, stirring occasionally, until the mixture comes to a boil.

19.   Cover and cook until the mixture comes to a low boil.

20.   Cook and stir over medium heat until mixture comes to a boil and is very thick and clear.