61.   Bring to boil over low heat, stirring frequently.

62.   Bring the mixture to a boil over low heat, stirring constantly.

63.   Bring to a boil, cover and reduce to low heat.

64.   Bring to simmer over moderately low heat, stirring constantly.

65.   Bring to a simmer, cover and keep over low heat.

66.   Brown noodles in melted butter over low heat.

67.   But he noted that it also makes a ticking sound that some people find irritating when the gas goes on and off to maintain a low heat.

68.   Caramelize the sugar in a saucepan over low heat, stirring frequently.

69.   Combine coffee and sugar and stir over low heat until sugar dissolves.

70.   Combine the ingredients in a medium saucepan, Stir constantly over low heat until mixture reaches a low, rolling boil.