(Long) Weekend Wonderings: How to heat and hold on a stove, substituting surfactants. and where contaminants in our products arise?

HOW TO HEAT AND HOLD ON A STOVE?In this post, Love writes: I know that heating and holding is very important but how can I control that the heat won’t go above 70˚C? On my stove, which is a generic stove, there are 3 different settings (1, 2 and 3). The problem however is that there’s no…