Ketchup

(this only applies to Ketchup eaten alone)

Brocho before eating this: Shehakol Niyeh Bedvoro

In most cases a proper shiur is not consumed, and therefore, no Brocho Achrona is required. However, in the rare case of consuming a proper shiur of this say: Borei Nefashos

Source: The Laws of B'rachos (page 371)