Sweet Fish Smash is a rare Sky Tenakth food in Horizon Forbidden West.
Acquisition
Sweet Fish Smash can be purchased from the Cooks at the Bulwark, Cliffwatch, and Stone Crest for 2 Coldwater Fish, 5 Winter Paleberries, and 
25.
Uses
Consuming Sweet Fish Smash boosts Aloy's Concentration+ skill by 3 Levels for 3 minutes. Additionally, it also restores 50% of her Health and Stamina.
Sweet Fish Smash can be sold for 8.