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Seir Food Identity independently reviewed
Food Identity How restaurants source, cook and care. Independently reviewed

Seir

A contemporary French kitchen in a sunlit glass veranda in Kasterlee, cooking daily changing menus built on local products and Japanese seasonings.

Food Identity How restaurants source, cook and care. Independently reviewed

Seir

A contemporary French kitchen in a sunlit glass veranda in Kasterlee, cooking daily changing menus built on local products and Japanese seasonings.

The essentials, at a glance


Documented practices
Independently
reviewed
Seasonal cooking

Documented practices

Seasonal cooking Menu rebuilt every day from available products

Style
Fine dining
Cuisine
French
Fusion
Asian
Good to know
Terrace
Wheelchair accessible
Recognised by
We're Smart Green Guide
Recognised by
We're Smart Green Guide

The delicious details

Seir opened in a glass veranda on the Geelsebaan in Kasterlee in the summer of 2018, built by a kitchen team around an aim they state plainly: quality dishes from local products, with respect for nature and their surroundings. Chef Thomas Van der Flaas runs the stove; An-Sofie De Ridder hosts the room and looks after the wine.

The register is contemporary French, loosened by the Japanese seasonings the chef keeps returning to: dashi, ponzu, shiro kombu. Plates are finished at an open counter in full view of the room, and guests are told they need not arrive in a suit.

The chef's menu is put together again each day around the best products of the moment. Autumn brings venison with celeriac and panisse, red mullet, and sea buckthorn with praliné and chocolate.

Menu
What's on the table, and what's left off

A contemporary French kitchen using Japanese seasonings, built around daily-changing menus from local products. Chef's menu at lunch, set and à la carte in the evening. Plates are finished at an open counter in full view of the room.

Cooking is contemporary French with Japanese accents: fresh pasta with lobster and bisque, scallop with beurre noisette, turbot under a lobster béarnaise, venison with celeriac and panisse. The composition of the recipes can change from one day to the next.

Three formats run alongside each other: a three course chef's menu at lunch, at 90 euro all in; a four or five course Menu Seir in the evening; and a short carte of three starters, three mains and four desserts, which steps aside on Friday and Saturday evenings. Wines are poured by the glass alongside the menus, with a designated driver arrangement and a run of non alcoholic juices as alternatives.

The kitchen asks guests to flag allergies and intolerances in good time and adapts the menu to individual needs where it can, with any extra ingredients billed separately. A fully vegan meal is not offered.

Cuisine

French
Fusion
Asian
Allergies & intolerances
How this kitchen handles the EU-14 allergens
Handled on request
Public sources point to a working level of allergen accommodation, but no dedicated preparation area. Treat this as a starting point and confirm directly.
Always confirm your allergy directly with the restaurant when booking.
Researched from public sources · seir.be · not yet confirmed by the restaurant
Impact score
How this restaurant rates
2 - Engaged

The chef's menu at Seir is put together again each day around the best available products. In autumn this brings venison with celeriac and panisse, red mullet, and sea buckthorn with praliné and chocolate; the carte moves with it, so seasonal produce is structural rather than decorative.

Seir is listed in the We're Smart Green Guide, the editorial guide to kitchens that give vegetables a central part. Its entry credits the team's balanced combinations and the taste nuances the vegetables bring to them.

The impact dimensions

Local & direct sourcing

Seasonal cooking

Sustainable animal products

Social impact✓

Local products are a stated kitchen value; one named supplier, Van Tricht, provides the cheese course.

The homepage carries 'lokale producten' among its core values, and travel journalism quotes the founding aim as quality dishes from local products. One supplier is named publicly: the cheese course on the carte is credited to Van Tricht. Beyond that, no producer is named and the share of key categories with local or regional origin is not demonstrated.

The evening menu includes Wagyu A5, sourced well outside the region. Level 2 is the honest reading: a stated kitchen value with a single named supplier and no concrete evidence of the sourcing base as a whole.

Strongest sourceRestaurant website ↗

The chef's menu is composed again each day around the best available products, shifting with the seasons.

The chef's menu is described as composed 'op basis van de beste producten en inspiratie van het moment', each day around the best products of the moment. The menu read at screening is coherently autumnal: venison with celeriac and panisse, red mullet, and sea buckthorn with praliné and chocolate.

Seasonal produce is therefore structural rather than decorative, and a quarterly rotation is comfortably exceeded by daily composition. Level 3 rather than 4 because only one menu period could be observed; two further seasons of archived menus would support level 4.

Strongest sourceRestaurant website ↗

Animal proteins are menu-led with named species; no welfare certifications or fishery labels are evidenced.

The menu is led by animal protein across both the carte and evening menus: turbot, lobster, langoustine, red mullet, scallop, shrimp and smoked eel on the seafood side; beef, beef tartare, venison, duck and Wagyu A5 on the meat side. Species and grades are named, but no butcher, fishmonger or farm is named.

No MSC, ASC, organic or welfare label appears on the menu or in any third party source. Smoked eel is served with no fishery or welfare qualification, and European eel is classified as critically endangered. Level 2: a protein-led menu carrying only generic origin claims.

Strongest sourceRestaurant website ↗

The founding story credits team partnership and menu development collaboration; no named community commitments are documented.

The We're Smart Green Guide describes the opening story around partnership and says the team shares creative responsibility for the menus. The chef's published profile credits the whole team with the creative work and names a former employer he admires for how he treats people.

These are positioning references rather than described commitments. No named charity, community project, apprenticeship scheme or stated employment policy is evidenced. Level 2: social themes in the positioning without specifics or a named organisation.

Strongest sourceChef profile ↗
Visit & practical info
Address, price, and more
Address
Geelsebaan 40, Kasterlee, Belgium
Open in Google Maps ↗
Price
€€€€
Format
Lunch set menu, evening set and à la carte, book ahead
Hours
MondayClosed
Tuesday12:00–13:00, 19:00–20:00
Wednesday12:00–13:00, 19:00–20:00
Thursday12:00–13:00, 19:00–20:00
Friday12:00–13:00, 19:00–20:00
Saturday12:00–13:00, 19:00–20:00
SundayClosed
Not captured during screening. The restaurant's reservation page states that Seir is closed on Sunday and Monday; the Michelin Guide entry records service Tuesday to Saturday at lunch and in the evening. To be filled from Google Places.
Style
Fine dining
Good to know
Terrace
Wheelchair accessible
Web
seir.be
Reviewed by My Treats
Last reviewed 15 Oct 2026
Reserve To website
Link copied
How we score
The My Treats impact scale

Every restaurant is assessed against SEERO, our six-dimension sustainability framework — covering sourcing, seasonality, waste, animal products, social impact, and plant-forward cooking. Each finding is weighted by how strongly it is corroborated. The combined result is translated into an impact score from 1 to 5.

The five levels

SEERO is an acronym for Starting, Engaged, Endorsed, Recognised, Outstanding:

Starting First verified signals of sustainable practice.
Engaged Credible practice across two dimensions.
This place
Endorsed Meaningful practice across three or more dimensions.
Recognised Strong practice across four or more dimensions, with independent corroboration.
Outstanding Top-tier practice, confirmed by recognised third-party audit.

How a level is reached. Each level needs two things together: a minimum number of dimensions covered, and a minimum overall strength of evidence across them. A dimension only counts once its evidence is specific and substantiated — a passing mention doesn't qualify. Meeting only one of the two keeps a restaurant a level lower.

Scores of four or five require human validation and, at the top tier, an external audit. Scores are based on publicly available evidence and restaurant submissions at the time of assessment.

Full methodology→
Impact dimension
—
How this dimension works
—
How evidence is weighted
Self-declared Stated by the restaurant on its website, menu or in a submission. Plausible, but not yet independently corroborated.
Researched Found through independent research; one credible third-party source backs the claim.
Vouched Corroborated across more than one independent source. Some gaps may remain.
Audited Fully corroborated across independent sources or by a recognised third-party certification.
What the sourcing checkmarks mean
✓ Full check — independently verified: corroborated across more than one source, or audited / third-party certified (vouched or audited).
✓ Light check — self-declared or from a single source. Not yet independently verified.
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