the.com/reduction sauce

Liquid patience — you boil away the water until flavor is the only thing left standing.

means A sauce made by simmering a liquid down until it thickens and its flavor concentrates, with no extra starch or thickener needed.

from From Latin 'reducere' (to lead back, bring back), via Old French 'reduire'. The culinary sense comes from the idea of 'reducing' a liquid back to its essential, concentrated state — the water is driven off as steam, so what's 'brought back' is pure flavor, not volume.

the trick
evaporation concentrates flavor, not a secret ingredient
math
reduce by half, intensity roughly doubles
common base
wine, stock, or cream simmered uncovered
chef lie
sauces are hard; sauces are just time
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