One of the ways in which environment affects the culture of a place is by determining which types of food are consumed regularly and how they are prepared. Iceland has a reasonably cold weather with harsh winters, and this has impacted how Icelandic people eat.
The Vikings that inhabited the region used to preserve their food with sour milk and by burying it underground. This was a consequence of the fact that salt was scarce and thus not common for preservation. Even though Icelandic people have more options nowadays, they still consume this type of food because it represents a way for them to preserve their Viking heritage.