What is
Soured milk is a food product, distinguished from spoiled milk, and is a general term for milk that has acquired a tart taste, either through the addition of an acid, such as lemon juice or vinegar, or through bacterial fermentation.
  
Booza, or Arabic mastic ice cream, is an elastic, sticky, high level melt resistant ice cream, which should delay melting in the hotter climates of the Arab world, where it is most commonly found.