Mostaza, SA is an Argentine fast food chain that was established in 1998.[1][2] Its specialities are hamburgers, sandwiches, desserts and café. It is the second largest fast food chain in its country, after the multinational McDonald's.
As of June 2011 Mostaza had 50 restaurants around the country, being present in hypermarkets, malls and on the street.[3] As of 2018, it doubled that amount to 110 stores.