Synonyms for Concoction:

n.

jumble, combo. dish, Groceries, foodstuff, nutrition, meal, nourishment, cooking, sustenance, food, fare. falsehood, a tissue of lies, lie, white lie, misinformation, untruth, fabrication, disinformation, invention, half-truth. broth (noun)
decoction.
combination (noun)
amalgamation, brew, blend, composite, infusion, conglomeration, incorporation, composition, admixture, hodgepodge, conglomerate, mix, fusion, combination, assembly, compound, commixture, mixture, alloy, paste, medley, amalgam, ensemble.
concoction (noun)
mixture, intermixture, confection.
creation, blend (noun)
combination, medley, solution, mixture, brew, compound.
food (noun)
mixture, intermixture.
mixture (noun)
mash, mongrel, elixir, decoction, meld, potpourri, hybrid, amalgamate, merger, blending, intermixture, Interfusion, emulsion, stew.

Other synonyms:

jumble, combo. Other relevant words:
confection, foodstuff, lie, fabrication, combo, dish, invention, solution.