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Time two Green Chef bags at once with a Claude cooking app

WorkedEvidence: Described by posterPosted Last checked

Claude built Simon Willison a dual Green Chef cooking app; both meals finished in 44 minutes, aside from the dog’s 6pm conflict.

Beginner-friendlyNo logins, payments or coding needed. Low risk: paste the prompt and you should get something useful.

How to use this

  1. Tap Copy prompt.
  2. Open Claude.
  3. Paste it into the message box.
  4. Send it, then read the answer before acting on it.
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Prompt

Recreated prompt

The source didn't share its exact prompt, so we wrote one from what it describes. The result shown is the source's, not ours.

What the prompt labels mean

The person didn't share their exact words, so we wrote this from what they described. We haven't tested it, and they didn't use this exact version.

Extract both of these meal-kit recipe cards in detail. Give me the full list of pots I need if I cook both at once. Then build a mobile-friendly interactive timer artifact with a start control, countdowns to the next steps, a full combined timeline, and localStorage so a reload does not lose my start time.

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ChatGPT Gemini Grok Claude Used in source

Sends the Recreated prompt shown above. ChatGPT and Grok open with it filled in, and ChatGPT may send it straight away. Gemini and Claude open empty, so we copy the prompt for you to paste. Every button also copies it.

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Optional stronger version

Our rewrite with extra checks. The poster didn't test it.

Before you start, ask me 1–3 short questions about the details below and wait for my answers. Once I've answered, confirm the plan in one line and run the whole task start to finish.

Goal: Extract two meal-kit recipes and build a combined cooking timer I can run on my phone.

Questions to ask me first:
- Am I cooking both bags at once for how many people?
- Any fixed family events (pet dinner, pickup) I must avoid?
- Where should the timer be hosted?

Inputs (fill in or confirm):
- Recipe photos: [UPLOAD]
- Servings: [4 FROM TWO BAGS]
- Hard stops: [PET DINNER 6PM / NONE]
- Hosting: [MY SITE / ARTIFACT]

Rules:
- Do not invent missing ingredients; flag unclear text.
- Persist start time across reloads.
- Keep the next step prominent with a countdown.

Checkpoint: Show extracted recipe titles and pot list before generating the timer.

If you get stuck: If OCR is uncertain, ask me to confirm a line instead of guessing.

Verify before you finish: Timeline covers both recipes without overlapping the same pan unrealistically.

Output: Pot list plus interactive timer with combined timeline.

Done when: I can press Start and finish both meals on time.

AI tool

Claude

Outcome

Simon Willison photographed two Green Chef recipe cards, had Claude Opus extract both recipes, list the pots needed, and build a no-React mobile cooking app timer artifact with a start button and localStorage persistence. Cooking for four from two two-portion bags finished both meals exactly 44 minutes after Start. One miss: the schedule collided with the dog Cleo’s 6pm dinner because that constraint was never mentioned.

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Source

Posted
by Simon Willison
Last checked
Method:
How we verify

https://simonwillison.net/2025/Dec/23/cooking-with-claude/

Context: Author notes light spot-check of OCR and one missed pet-dinner constraint.

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