Book 1AVAILABLE
The Choice Algorithm
Menu psychology and architecture: how guests choose, how a menu is put together and how a change to it is measured.
Menu Trilogy · Book 3 · Srđan Mihailović
THE AIecosystem
QR menu, allergen matrix, POS and KDS as one system — a source for every rule, an owner for every datum and a human for every critical decision.
122pages, PDF
25chapters in six parts, from the system to the monthly review
18printable forms, A-01 to A-18
6source labels, with every claim
The Menu Trilogy
Three books. One menu that works for you.
The first book explains how guests choose, the second what every dish really costs and earns, the third how software runs all of it for you. Each one also stands on its own.
1 · Guests chooseMenu psychology and architecture
2 · Numbers decideFood cost, standard recipes, pricing, stock
3 · Software runs itQR menu, allergens, till and kitchen
Book 2AVAILABLE
The Code Equation
Menu maths: the recipe card to the cent, yield, sub-recipes, portions, purchasing, pricing with VAT, drinks, stock and the monthly reconciliation.
Book 3AVAILABLE
The AI Ecosystem
The menu in the digital world: QR menu, allergen matrix, till and kitchen screen as one system — with one source of truth, one order id and a human for every critical decision.
- 122 pages · 18 forms · English edition
- also in Serbian: AI ekosistem
What makes it different
Every claim says where it comes from.
Software vendors promise that “AI will sort it out”. This book labels every claim: EU or US regulation, a standard, hospitality practice, the author’s proposal or an example from a made-up restaurant. Law is never mixed up with advice, and advice is never passed off as law.
EUUSSTDPRAXAUTCASE— six labels, the same throughout the book
All 14 allergens must be available to the guest before the purchase — for non-prepacked food and for distance selling too: QR, web shop, platformRegulation (EU) 1169/2011, Annex II, Arts 9, 14(2) and 44EU
“Gluten-free” may only be claimed up to 20 mg/kg of gluten — non-prepacked food includedImplementing Regulation (EU) 828/2014EU
No “safe” level of allergen traces has been set by the EU, Codex or the FDAFDA public meeting, February 2026; Codex CXC 80-2020EUUSSTD
An inspector may ask for access to your computer systems, not only your paperworkRegulation (EU) 2017/625, Art. 15(1)(b)EU
AI transparency obligations apply from 2 August 2026Regulation (EU) 2024/1689 (AI Act), Art. 50EU
Text enlarged to 200% loses nothing; at 320 px there is no horizontal scrollingWCAG 2.2, success criteria 1.4.4 and 1.4.10STD
The daily check of the person in charge, active managerial controlFDA Food Code 2026, 2-103.11; HACCP record disciplineUSPRAX
Three lanes for AI: act and log · propose and approve · block until validatedthe book’s operating modelAUT
Friday, 18:55: a nut-allergic guest, the same order before and after the systemAcacia, a made-up restaurantCASE
Every allergen, price or recipe change an AI proposes waits for a human — zero silent critical changesthe book’s rule, Chapters 1 and 17AUT
Contents
Six parts, 25 chapters. One system.
From what an ecosystem is and which rules touch it, through the allergen matrix, the QR menu, POS and KDS, to AI as an assistant and the rhythm of daily, weekly and monthly checks. Every part has its own forms, a worked example from one restaurant and sources at the end of each chapter.
| Part | Title | Chapters | Forms in the book |
|---|---|---|---|
| I | The System | 1–4 · ecosystem, rules, roles, human-in-the-loop | A-01 System map · A-02 AI use-case register |
| II | The Allergen Matrix | 5–8 · live data, recipe and variant, cross-contact, the KDS flag | A-03 Allergen matrix · A-04 Recipe register · A-05 Cross-contact controls · A-06 Allergen trace |
| III | QR Menu as Digital Host | 9–12 · QR is not a PDF, accessibility, phishing QR, guest data | A-07 QR launch checklist · A-08 Accessibility & language · A-09 QR physical & data minimisation |
| IV | POS, KDS and the Order Bus | 13–16 · one order id, POS, KDS, delivery platforms | A-10 Integration validation · A-11 POS & KDS pre-shift check · A-12 Digital incident |
| V | AI as Assistant | 17–21 · what AI may do, descriptions and forecasts, Books 1 and 2 inside the system, hallucinations, vendors | A-13 AI output review · A-14 Vendor due diligence & exit · A-15 AI incident |
| VI | The Operator Cadence | 22–25 · 15 min daily, 45 weekly, 90 monthly, Acacia before and after | A-16 Daily board · A-17 Weekly review · A-18 Monthly governance |
6 parts · 25 chapters · 18 formsPlus: glossary, index of controls and sources
Look inside
The same restaurant. A different architecture.
Acacia is the same made-up restaurant as in the first two books: 70 seats, the same menu. Friday, 18:55: a nut-allergic guest orders the goat’s cheese salad through a delivery platform. Before the system, the allergy is a sentence in a note; after it, a structured flag that reaches the kitchen screen, calls for a separate board and leaves a record. The building did not change. The data ownership did.
Price
One book, one price. Everything included.
Each book of the trilogy is one product: the book with every form, workbook, template, poster and video guide that goes with it. Nothing to add on.
Book 3 · available
The AI Ecosystem
The book and every resource with it, for your business and your team.
What you get
- The AI Ecosystem e-book, 2026 edition, PDF, 122 pages, with a glossary, an index of controls and sources
- 18 printable A4 forms (A-01 to A-18): system map, allergen matrix, POS–KDS integration test, vendor AI due diligence and exit test, daily, weekly and monthly reviews
- The same forms to fill in on screen, in A4 and US Letter
- Excel: system map and AI use-case register (the lane calculates itself), allergen matrix with the recipe tree, POS–KDS integration test
- Excel: weekly KPI and incidents, vendor due diligence and exit test, access and retention
- Acacia workbook: Friday at 18:55 before and after, the change table, the metrics and the numbers from Books 1 and 2
- Word templates: AI use policy, a checklist for a software and AI vendor contract, the digital service SOP for the pass
- AI prompts for ChatGPT, Claude and Gemini, each with a test on the Acacia example
- Monthly review kit: agenda, metrics, incidents, access, vendors, checklist, decision log
- Wall posters (A3): 14 allergens, the red KDS banner, three AI lanes, the daily pre-shift check, five rules of digital service
- Video guides for every Excel workbook
- The owners’ community on WhatsApp and Viber
The workbooks run in Excel (2019 or newer), Google Sheets and LibreOffice; the templates in Word, Google Docs and LibreOffice.
The whole trilogy: all three books for €99
Each book costs €39. All three together cost €99 instead of €117 — you save €18. All three books are out; if you have already bought one or two, you only pay the difference for the set.
Book 1 · The Choice Algorithm
€39
Available · early buyers −30%: €27.30Book 2 · The Code Equation
€39
Available · early buyers −30%: €27.30Book 3 · The AI Ecosystem
€39
Available · early buyers −30%: €27.30Purchases go through Gumroad. After payment, the download link arrives in your inbox straight away.
Who it is for
For the people who answer for what the guest sees. And for what the kitchen does.
This book is for you if
- you run a restaurant, bistro, bar or hotel restaurant and are bringing in — or already have — a QR menu, a POS, a KDS or delivery platforms
- you are a head chef who answers for allergens and for what reaches the plate
- you are choosing software or an AI tool and want to know what to ask for in the contract and how to leave with your data
- you are a consultant who brings digital tools into hospitality businesses
This book is not for you if
- you want a manual for one particular program or till
- you want AI to publish allergens, prices and recipes on its own, without a human
- you want legal advice — the book shows where the rule is; check how it applies with a professional
About the author
Srđan Mihailović
More than thirty years in hospitality: in top hotel kitchens and restaurants, and on cruise ships. He has worked and lived on four continents and knows both sides of the business — the one at the stove and the one at the owner’s desk.
He is the founder and owner of Gostíno.ai, an agency that helps hospitality businesses run their work with digital tools.
The same job is bound by the same problems everywhere.
Questions
Before you choose
What format is the book?
A 122-page PDF, 2026 edition. It reads on a phone, a tablet and a computer. The printable forms are A4; the forms you fill in on screen come in A4 and US Letter.
What language is it in?
British English. There is also a Serbian edition, AI ekosistem, with the same content.
Do I need to read The Choice Algorithm and The Code Equation first?
No. The AI Ecosystem stands on its own. If you have the first two, you will recognise Acacia, and Chapter 19 shows how the menu matrix from Book 1 and the recipe card from Book 2 work inside the system, from the same recipe tree.
Does the book recommend a particular software?
No. The book sells and praises no program. It gives the rules, tests and forms to check any QR menu, POS, KDS or AI tool — and the vendor contract, including an exit test with your data.
Does it work for my country?
The book relies on EU rules (allergens, hygiene, official controls, data protection, the AI Act, accessibility) and the US FDA Food Code, with standards such as WCAG and Codex — each with its source. It is not legal advice: before you decide, check how your country has implemented the rule.
What do the labels EU, US, STD, PRAX, AUT and CASE mean?
Every claim says where it comes from: EU or US regulation, a standard, hospitality practice, the author’s operating proposal or an example from a made-up restaurant. That way law is never mixed up with advice.
What comes with the book?
Everything: printable and fillable forms, six Excel workbooks and the Acacia workbook, Word templates, AI prompts, the monthly review kit, wall posters and video guides. Nothing to add on.
How does the trilogy set work?
Each book costs €39; all three together cost €99. All three books are out. If you have already bought one or two, you only pay the difference up to €99.
Are the examples from a real restaurant?
No. Acacia is a restaurant we made up, the same as in the first two books. Its numbers show the method; they don’t promise a result. Every fact from regulation and standards has its source at the end of the chapter.
How do I get the book after buying?
Purchases go through Gumroad. After payment, the download link arrives in your inbox straight away.
From the same collection
More books from the Gostíno library
The Choice AlgorithmMenu Trilogy, Book 1: menu psychology and architecture.
The Code EquationMenu Trilogy, Book 2: food cost, standard recipes, pricing and stock.
Restaurant CodeTen mistakes that cost restaurants money — and the system that stops them.
HACCP CodeRestaurant food safety under EU and US rules: seven principles, one plan.
Cult of FireThe Serbian BBQ Bible: 50 recipes, from the Leskovac ćevap to the Leskovac Train.
One truth, one id, one human.
AI proposes. The system controls. A human answers.