Prepping as already suggested helps a lot. But make use of appliances too.

A fish fillet can cook in the oven in 40 minutes but does not require care while cooking.

A slow cooker is a god send. You can start your ribs the night before and they’ll be ready for lunch.

Then pasta takes 10 minute to cook and you can just prep some veggies/souces in advance.

Seems so. Checked the sources and there’s no upload/download. And testing it I can confirm the network tab in the dev tools is silent. Everything work local side. Probably with some additional work this could be converted to a PWA (Progressive Web App) and work completely offline.

The good place