Eritrean€€bahnhofsviertelMon-Thu 16:00-23:00; Fri-Sat 13:00-23:00, kitchen until 22:00; closed Sun
Im Herzen Afrikas stretches a Frankfurt food budget furthest when shared, Eritrean platters that feed two for one main-course price elsewhere.
Try: Vegetarian injera platter, shared
Tip: The vegetarian platters are the value champions; count one platter per two people and add injera before adding dishes.
Modern European€€€altstadtMon-Fri 11:30-22:00; closed Sat-Sun and holidays
Medici's €29.50 business lunch is Frankfurt's white-tablecloth bargain, a Michelin Guide kitchen at weekday-menu pricing near the Römer on weekdays.
Try: Business lunch, two courses €29.50
Tip: It stretches the definition of budget upward, but per course this is the cheapest polished cooking in the Altstadt.
German€innenstadtMon-Fri 08:00-18:00; Sat 08:00-16:00; closed Sun
Edel's stand in the Kleinmarkthalle plates Frankfurt's cheapest proper Grüne Soße, eaten standing among the market crowds at lunch every weekday.
Try: Grüne Soße with eggs at the market counter
Tip: A full plate costs less than a cocktail across town; pair with a roll from Huck's stand two aisles over.
German€innenstadtMon-Fri 08:00-18:00; Sat 08:00-16:00; closed Sun
Schreiber's sausage counter in the Kleinmarkthalle is Frankfurt's definitive cheap lunch, hot Fleischwurst handed over the glass for pocket change.
Try: Hot Fleischwurst with mustard and a roll
Tip: Cash ready, order fast, eat standing; the whole transaction takes ninety seconds once you reach the front.
German€€sachsenhausenDaily 11:00-00:00
Apfelwein Wagner proves Frankfurt tradition is a budget cuisine: Handkäs at €5.10 and Rippchen with kraut under €15 on Schweizer Strasse every day.
Try: Handkäs mit Musik at €5.10, Grüne Soße at €14.50
Tip: Order Handkäs and a Schoppen for the cheapest authentic Frankfurt dinner going; bread comes with it, and nobody hurries you out.
South Indian€€bahnhofsviertelDaily 09:00-22:30
Saravanaa Bhavan feeds Frankfurt generously for little on Kaiserstraße, dosa and thali portions that defeat most appetites at lunch prices and dinner alike.
Try: Masala dosa or the full vegetarian thali
Tip: The thali is the value play: multiple curries, rice, bread and dessert on one tray, refilled in the South Indian tradition.