I keep my recipies on my website, and like most of my website it grew over time instead of being designed. A couple years ago I added some progressive enhancement that puts checkboxes on the ingredients, and today I added a rescaler:

Here's tripling it:

This is another project, like adding transposition to my solstice songbook, where I wouldn't have put in the time if I couldn't delegate to an LLM. It went very quickly, and the code seems reasonable.

Implementation notes:

• As you go up and down it converts teaspoons to tablespoons to cups. Yes, I still cook volumetrically.

• It handles numeric ranges, like "3-4 cups".

• It handles fractions: half of 1 1/4 C is 5/8 C.

It doesn't handle everything. I wanted something simple and reviewable that handles most cases, instead of trying to make something exaustive (that would then have weird bugs). This means with complex items like "2 eggs (or 2T flax and 5T water)" only the "2 eggs" is scaled. To make these failures graceful, all scaled values are bolded, so unscaled values stick out visually.