That's easy: Use non-dairy milk. Soy milk in particular makes a great substitute for regular milk and creates a nice, thick buttermilk replacement. All you have to do is add lemon juice or vinegar ...
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5 Substitutes for Buttermilk
This is the buttermilk substitute I use the most because I always ... Milk (Soy or Almond Milk + Lemon Juice or Vinegar) Not ...