- Kei Kobayashi opened Restaurant Kei at 5 Rue Coq Héron in 2011 and remains chef-owner.
- The restaurant currently serves dinner Tuesday to Thursday and lunch and dinner Friday and Saturday.
- Its live offer includes Découverte, Dégustation, Prestige, Horizon and Grand Horizon menus priced from €195 to €580.
- A February 2026 first-hand review documented the vegetable garden, blue lobster and Gunma beef in current service with calm professional hospitality.
- The vegetable garden combines raw and cooked seasonal vegetables with smoked salmon, herb cream, lemon emulsion and black-olive crumble.
- Independent full-menu reporting has documented exact shellfish cookery, calibrated acidity, precise seasoning and a consistent progression through savoury and dessert courses.
- Kobayashi’s French regional sourcing includes line-caught sea bass, game, vegetables from several French regions and citrus grown near Perpignan.
- The chef has published three books and extended his ideas through separate Japanese projects, giving the Paris restaurant’s language a documented consequence beyond one dining room.
No unannounced visit is claimed. The current official menu and hours are combined with a February 2026 first-hand review, a detailed independent 2021 full-menu review, current professional profiles and long-run reporting. The strongest dish-level evidence spans more than one period and agrees on the restaurant’s identity, technique and execution.