Dependence on a single supplier for seasonal products can shut down your kitchen and destroy your margins. Think asparagus in May, oysters in December, or strawberries in June - if your only supplier fails, you're left empty-handed. Here's how to map out these risks and spread them across multiple sources.
Check your supplier dependence per seasonal product
Start with an inventory of your seasonal products and their suppliers. Seasonal products are ingredients you can only purchase during certain months at reasonable prices.
💡 Example seasonal products:
- Asparagus (April-June): usually 1 fixed supplier
- Game (October-February): often specialized supplier
- Oysters (September-April): limited number of importers
- Fresh truffles (October-March): exclusive suppliers
List your 10 most important seasonal products. For each product, note how many suppliers you have and what percentage of your purchases go through your main supplier.
Calculate the impact of supplier failure per product
For each seasonal product, you need to know what it means if your supplier fails. Do this by calculating the revenue impact.
💡 Example calculation:
Your asparagus menu runs for 6 weeks per year:
- Asparagus per week: €800 cost of goods
- Asparagus dish sales: €2,400/week
- Total season: €14,400 revenue
If your supplier fails: €14,400 revenue at risk
Calculate this for all your seasonal products. Add up the amounts - that's your total risk if a supplier fails.
Identify critical dependencies
A supplier becomes critical if failure puts more than 10% of your monthly revenue at risk. Or if there aren't good alternatives available within 48 hours.
- High revenue impact: Seasonal product features in popular dishes
- No alternatives: Supplier has a monopoly on the specific product
- Short shelf life: Product must be delivered within 1-2 days
- Quality differences: Other suppliers have lower quality
⚠️ Note:
Seasonal products often have limited suppliers. What has 5 options in summer might have only 1 option in winter.
Build a backup supplier network
For each critical seasonal product, you need at least 2 suppliers. The second doesn't have to be perfect, but it needs to get you through a crisis.
💡 Backup strategies:
- Second supplier: Test with a small order once per month
- Wholesale backup: More expensive but always available
- Replacement product: Another seasonal product as alternative
- Frozen inventory: For products that can be frozen
After managing kitchen operations for nearly a decade, I've learned to negotiate with your main supplier about warning time if problems occur. Ask for at least 48 hours notice of delivery issues.
Monitor your spread with the 70% rule
No single supplier should represent more than 70% of your seasonal purchasing value. And no single seasonal product should make up more than 15% of your monthly revenue.
- Per supplier: Max 70% of seasonal purchases
- Per product: Max 15% of monthly revenue
- Per season: Spread across multiple suppliers
Check these percentages every month. Especially at the start of a new season, as you're signing new contracts.
Track supplier dependence with digital tools
Record multiple suppliers per ingredient with their prices and contact details. This way you immediately see what alternatives you have if your main supplier fails.
You can also track your purchase history per supplier. This shows how dependent you really are and helps you spread your risk.
How do you check supplier dependence? (step by step)
Inventory seasonal products and suppliers
Make a list of all seasonal products you use. For each product, note which suppliers you have and what percentage of your purchases go through your main supplier.
Calculate revenue impact per product
Calculate how much revenue each seasonal product generates per season. Multiply weekly revenue × number of weeks the product is available.
Identify critical dependencies
Mark suppliers that represent more than 70% of your seasonal purchases or whose failure would put more than 10% of your monthly revenue at risk.
Find backup suppliers
For each critical seasonal product, find at least 1 alternative supplier. Test them with small orders during the season.
Monitor spread monthly
Check your 70% rule every month: no supplier more than 70% of seasonal purchases, no product more than 15% of monthly revenue.
✨ Pro tip
Audit your seasonal supplier spread every 3 months - not just at season start. Track if any single supplier creeps above 70% of your seasonal purchases during peak months.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
What if my backup supplier is 30% more expensive?
That's acceptable for emergencies. Calculate it: 30% higher cost on 1 product is cheaper than 100% revenue loss on all dishes with that product.
Can I replace seasonal products with frozen alternatives?
For some products yes, but quality and taste are often lower. Use frozen as a last resort, not as a standard backup.
How often should I stay in touch with backup suppliers?
Test with a small order at least once per month. This keeps you on their radar and ensures quality and service are still up to standard.
What's a reasonable warning time for delivery problems?
Ask for at least 48 hours notice from your main suppliers. For seasonal products preferably 72 hours, so you have time to arrange alternatives.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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