[theironlily]

Perhaps the restaurant uses a lot more rice for the rolls and the nigiris, or offer to fill up patrons with green tea or miso soup. Or, they are constantly busy and make their margins by the sheer number of patrons coming in for the incredible deal!

[Benji_San]

There are also quite a few all-you-can-eat-sushi buffet places in Turku, all with the same price of around 10€ during lunchhours.

A interesting part that was left out from the initial post is that we have these "lunch coupons" in Finland. AFAIK most employers provide these for their employees either as part of the total compensation or allow the employees to buy them tax free. The idea is basically that you get lunch for the coupon, the max valued coupon is currently worth 10,70€. Seeing how more or less all restaurants that serves lunch accepts these coupons I don't think it is possible to charge much more than the max valued coupon.

[vnorilo]

In Helsinki, most good lunches are more than the 10.80€ maximum. Everyone is paying the overage of 0.5-1€ with their card. For people unfamiliar with the system, the lunch coupons you use are deducted from your salary pre-tax, so it's significantly cheaper.