Gen (Vadhana)

The Verdict

If you have been to Gen once and left thinking it was a solid yakitori night out, it is worth returning with more intention. The Japanese eel dishes, when available, are the reason to come back; and availability is genuinely limited, making them the kind of thing you order the moment you see them on the menu rather than waiting for a second pass. Two consecutive Michelin Plates (2024 and 2025) confirm this is not a casual grill joint: it is one of the more focused Japanese dining rooms on Sukhumvit, at a ฿฿ price point, it sits in a different tier from the ฿฿฿฿ heavy-hitters that dominate Bangkok's awarded Japanese scene.

The Space

Gen occupies a room that reads like a Japanese whisky bar that expanded its kitchen rather than a restaurant that added a drinks list. The vintage feel is deliberate: dark tones, deliberate lighting, the kind of spatial restraint that signals the food is the point. It is an intimate setting, that intimacy is part of the value proposition. If you are comparing this to the sleeker, more hotel-adjacent Japanese rooms in Bangkok, Gen's atmosphere is warmer and more personal; closer to what you would find in a small Tokyo neighbourhood restaurant than a Bangkok concept dining room. For a two-leading on a midweek evening, the room works well. For groups of four or more, check whether the layout can accommodate you before booking.

The Menu Logic

The menu at Gen does not limit itself to yakitori, which is one of its practical strengths. Sashimi, rice dishes, noodles all feature alongside the grill work, which means the meal can be built with more structure than a pure skewer-by-skewer progression. The standout logistical detail: ingredients including the prized Hitachi wagyu beef are flown in from Japan, which anchors the quality ceiling meaningfully above what most mid-range Bangkok Japanese restaurants can claim. Hitachi wagyu is a specific regional product from Ibaraki Prefecture with a documented reputation for marbling quality, if wagyu preparation is the measure, this sourcing matters.

The eel dishes are the editorial peak of the menu, they deserve planning. There are reportedly multiple preparations available, which is rare even by Tokyo standards for a room at this price. Japanese eel (unagi) is a seasonal and supply-constrained ingredient at the top of times, so the availability of multiple preparations at Gen is the single clearest signal that the kitchen is doing more than covering the category basics. Go with the expectation of ordering them, if they are not available on the night, adjust your visit accordingly, the rest of the menu is strong enough to carry the evening, but the eel is the reason to come back specifically.

Staff service follows a traditional Japanese model: attentive, formally presented, process-oriented rather than conversational. If you have been once and found the service slightly formal, that is by design rather than indifference. It suits the room.

Booking and Timing

Booking difficulty is rated Easy, which at a Michelin Plate venue in Bangkok's Sukhumvit corridor is genuinely useful information. You do not need to plan weeks ahead, but a same-day booking on a Friday or Saturday evening is not a given for a two-leading. Midweek evenings are the low-friction option. Gen is located on Soi Sukhumvit 63 in Watthana, which puts it in a walkable zone from the BTS Ekkamai station and within range of the wider Thonglor-Ekkamai dining cluster. If you are building a Bangkok evening around the neighbourhood, Shirokane Tori-Tama and Den Kushi Flori are both nearby Japanese options worth knowing if Gen is full.

How It Compares to Bangkok's Japanese Field

Within Bangkok's awarded Japanese tier, Kinu by Takagi and Yamazato operate at higher price points with more formal kaiseki frameworks. Gen sits below those in cost and formality, but its sourcing credentials and Michelin recognition mean it punches above the mid-range Bangkok Japanese average. For a comparative reference outside Bangkok, Myojaku and Azabu Kadowaki in Tokyo illustrate the upper end of the category Gen is drawing from stylistically. Gen is not competing at that level in technical ambition, but it is the clearest Bangkok equivalent of that intimate, ingredient-led Japanese grill format at a price that makes regular visits realistic.

Beyond Bangkok, if you are travelling through Thailand and want to benchmark the country's awarded Japanese scene, PRU in Phuket and AKKEE in Pak Kret are worth noting, though the cuisines are not directly comparable. For the full Bangkok dining picture, see our full Bangkok restaurants guide, and for planning the rest of a Bangkok trip, our hotels guide and bars guide cover the wider context. Thailand-wide, Anuwat in Phang Nga, Aquila in Chiang Mai, and Ayutthayarom in Phra Nakhon Si Ayutthaya are all on Pearl's radar for different reasons. For experiences and wineries in the city, our Bangkok experiences guide and wineries guide are the starting points. The Spa in Lamai Beach rounds out the Thailand picture for those moving beyond the capital.

The Bottom Line

Gen is the kind of place that rewards a second visit more than a first. If you already know the menu, come back for the eel and the wagyu. If you have not been, book a midweek evening, build the meal around the grill and sashimi, treat the eel dishes as the target rather than the afterthought.