Fast food restaurants

Mostaza

A 22-seat kitchen run by Eleni & Yassine, serving the dishes their grandmothers argued about on Tuesday nights in Kreuzberg.

Blvd. Juan Manuel de Rosas 658, B1712 Plaza Oeste, Provincia de Buenos Aires, Argentina $10,000–20,000
3.1
229 notes from regulars
01 The story, in three paragraphs

Why everyone keeps coming back.

Mostaza, located in the bustling Blvd. Juan Manuel de Rosas 658 within the lively Plaza Oeste shopping center in Provincia de Buenos Aires, is a beloved fast food restaurant offering a quick and satisfying dining experience for locals and visitors alike. As a go-to spot for fast food lovers craving classic Argentine-style burgers with a modern twist, Mostaza delivers a flavorful menu centered around hearty hamburgers and crispy sides.

The highlight for many customers is the popular Junior cheeseburger, which featured in a recent promotion for just $1100 ARS, making it an affordable indulgence. This burger tantalizes with a juicy beef patty complemented by melted cheese and fresh toppings, creating layers of savory goodness that satisfy even the most discerning fast food aficionados. For those with a bigger appetite, the option to upsize fries and drinks adds great value, enhancing the overall meal experience.

Speaking of fries, Mostaza’s golden pommes frites are a classic favorite, though some guests noted occasional inconsistencies, such as slightly overcooked or dry fries. Despite this, the fries remain a crispy, flavorful complement to the main dishes, perfect for dipping and sharing. Aside from the Junior, other standout choices include the “Mega simple de luxe,” a burger praised for its satisfying flavors, and the “hamburguesa pampeana doble,” a double patty option that embodies the heartiness Buenos Aires fast food is known for.

The atmosphere inside Mostaza balances the energetic vibe of a shopping mall with the casual comfort of a fast food joint. Customers appreciate the speed of service, necessary during peak hours, and many highlight the friendly, attentive staff who strive to maintain a pleasant dining environment despite busy shifts. It’s a space designed for quick bites rather than long lingering, making it perfect for a pit stop amid shopping or errands.

Real customer voices bring the ambiance and food quality into focus: Luciana Leon celebrates the flavorful burgers and attentive service, while Ezequiel Torres and Naty Reifer acknowledge occasional preparation hiccups but commend the overall positive experience. Lucho Gambi’s mention of the clean yet simple setting inside the shopping center captures the essence of Mostaza—a dependable fast food option catering to both taste and convenience.

Whether you’re craving a fast and juicy burger after a day of shopping or simply looking for a familiar and affordable meal, Mostaza in Plaza Oeste stands out with its authentic Argentine fast food charm. It’s a place where quick service meets well-crafted flavor, creating an easy, satisfying fast food experience in the heart of Buenos Aires’ vibrant retail scene.

03 Notes from regulars

229 notes — the real pulse of the room.

3.1
Based on 229 verified notes
5 74
4 35
3 26
2 17
1 78
All
Luciana Leon.
2 month ago
Muy rico. Está la promo de $1100 de la hamburguesa con queso “Junior “ Es muy rica y se pueden agrandar papas y bebida. Lo único bajo 1 estrella las papas estaban un poco quemadas… Secas… Las chicas excelente atención!!
Save Share
Ezequiel Torres.
4 month ago
Bastante bueno el lugar, necesita un poco más de atención pero aveces como están muy lleno lo hacen muy rápido y no siempre está bien preparado.
Save Share
Naty Reifer.
4 month ago
Buen lugar, la mega dibu no fue tan wooo cómo la pintan, y las hamburguesas hay que revisarlas, a una le faltó una carne cuando fui reclamar me la cambiaron pero no le pusieron la panceta que tenía que ir.
Save Share
Lucho Gambi.
5 month ago
Es un local de comida rápida, y cumple con su función, por eso la valoración positiva. Fueron muy rápidos con el pedido. Por otro lado, pedí agua y me dieron una botella de Smartwater (personalmente no es muy de mi agrado) con un vasito de plástico que no estaba perfectamente limpio, pero nada grave. El local está en el shoping, así que puntaje de ambiente aceptable. La hamburguesa pampeana doble la cobraron 2100 el 17/2/23 Saludos
Save Share
olga flores.
5 month ago
Paseando hicimos una parada en Mostaza , pedimos Mega simple de luxe y sprite estuvo rico
Save Share
TiernSis.
6 month ago
Yo no tuve problema con la atención, bastante bien y rapido. Lo unico que senti que la hamburguesa no tenia mucho gusto, el cheddar casi ni sabor tiene, y la carne tampoco. Dentro de todo las papas estaban ricas y la gaseosa también
Save Share
Camila Oviedo.
6 month ago
La Atención de Nahiara el día viernes 07/02 fue amorosa, fui a merendar con mis papás y ella nos sirvió muy amable. Da gusto cuando existe gente así.
Save Share
Mateo Peralta.
6 month ago
Muy buen Mostaza. Una buena atención al cliente. La comida te llega re rápido. Me hubiese gustado la hamburguesa más caliente, pero estaba muy buena
Save Share
04 When to visit & how to find us

Hours & the door on Bergmannstraße.

Opening hours
Monday 10:00 AM - 11:00 PM
Tuesday 10:00 AM - 11:00 PM
Wednesday 10:00 AM - 11:00 PM
Thursday 10:00 AM - 11:00 PM
Friday (today) 10:00 AM - 11:00 PM
Saturday 10:00 AM - 11:00 PM
Sunday 10:00 AM - 11:00 PM
Finding the door

Blvd. Juan Manuel de Rosas 658, B1712 Plaza Oeste, Provincia de Buenos Aires, Argentina

05 What makes this place friendly

The details you usually have to call and ask.

Service options
  • No-contact delivery
  • Delivery
  • Takeout
  • Dine-in
Highlights
  • Great coffee
Popular for
  • Lunch
  • Dinner
  • Solo dining
Accessibility
  • Wheelchair accessible entrance
  • Wheelchair accessible parking lot
  • Wheelchair accessible restroom
Offerings
  • Coffee
  • Quick bite
Dining options
  • Breakfast
  • Lunch
  • Dinner
  • Dessert
  • Seating
Amenities
  • Restroom
Atmosphere
  • Casual
Crowd
  • Groups
Payments
  • Credit cards
  • Debit cards
  • NFC mobile payments
Children
  • Good for kids
  • High chairs
  • Kids' menu
Saved this place? Add a note after your visit.

Notes from real diners are how the next person finds this table. 50–80 words is perfect.

Write my note