Definitions of concoction:

• noun:   the invention of a scheme or story to suit some purpose

  Example: "His testimony was a concoction"

• noun:   an occurrence of an unusual mixture

  Example: "It suddenly spewed out a thick green concoction"

• noun:   any foodstuff made by combining different ingredients

  Example: "He volunteered to taste her latest concoction"

• noun:   the act of creating something (a medicine or drink or soup etc.) by compounding or mixing a variety of components