The funny thing is that one taco makes a faecal megagram, if it’s the right kind of delicious, filthy taco.

A double boiler can’t get hotter than 100 C anywhere, until all the water boils off. A directly heated pot can get hotter in spots leading to undesirable reactions.

The double boiler also heats more gently because water absorbs so much heat. You are less likely to overshoot the target temp, especially if someone is watching the pot. A watched pot never boils, so by observing the double boiler you limit its temperature.

I brought a shit ton of tacos. Or I have supplied us with a faecal megagram of tacos. You be the judge.