Premise: Polarbröd is a Swedish bread company. Their head office is in Älvsbyn in northern Sweden. Polarbröd is Sweden's third-largest bread company. Its typical product is a soft compact bread formed into round, flat shapes. It is also noted for ready-made sandwiches produced from such bread and reindeer meat, which was introduced as a product in the 1960s under the name "renklämma".
Hypothesis: There are a variety of renklama filling that can be hot or cold.