Delicious Goulash slows the normal rate of accumulation subtractively to a rate of 0.5%/s (maxes out in 200s), but has no change towards the Sheer Cold accumulation rate when wading or being in Snowstorms. It is unknown if this is intentional or an error. For Suspicious Goulash, it only subtracts 0.3%. For Normal Goulash, it only subtracts 0.4%.
Like most foods, this has no effect for other players in Co-Op Mode.