Excellent! I may get that "one ingredient" thing down yet. Here's my idea for "what's next"
A sauce pan made with a heat-sensitive strip, so when the cooking ingredients reach a certain temperature, the strip indicates it by changing color. Think along the lines of sugar temperatures for different stages of candy making.
The color of the indicator on the pan would tell you when you've reach soft ball, hard ball, soft crack and hard crack stage. Or even making lemon curd...you stop when the pan says the contents are 170 degrees.
Certain metals have specific properties, so I'll bet we see this in the future. Just wish I was smart enough to patent the idea myself.