[1] Kalles Kaviar is mainly made of salted cod roe (Gadus morhua), sugar, rapeseed oil and spices.

It is officially credited as having been introduced in 1954, but probably existed even earlier as advertisement for the product appeared in newspapers as early as 1950.

The tube label has maintained the same design from the beginning, and depicts the son of the then-CEO of the manufacturing company, Carl Ameln.

The tube had to be made of aluminium rather than plastic because caviar cannot stay fresh when in contact with air, and plastic tubes become filled with air when the contents have been squeezed out, whereas aluminium remains in the form it was pressed into.

[5] In the 21st century, the Swedish smörgåskaviar market has fractured, with each supermarket chain promoting its own brand.