Noun
The quality or state of being sour.
Source: Webster's dictionaryMany of these are not strains of brewer's yeast (Saccharomyces cerevisiae) and may have significant differences in aroma and sourness. Source: Internet
In Indonesia, shallots are sometimes made into pickles that are added to several traditional foods; the pickles' sourness is thought to increase one's appetite. Source: Internet
"All good secrets have a taste before you tell them, and if we’d taken a moment to swish this one around our mouths, we might have noticed the sourness of an unripe secret, plucked too soon, stolen and passed around before its season." Source: Internet
Note: Ground sumac has a hint of sourness; as a substitute mix grated lemon… Source: Internet
The key to this soup is to balance the sweetness that comes from the sweet potato and coconut milk with the spiciness of the cayenne or chili pepper, plus the sourness of lemon juice. Source: Internet
I added some sourness by using some well drained feta cheese. Source: Internet