Can technology fix food cost variance on its own?

It can measure and surface the gap faster, which is genuinely useful, but it cannot close it for you. Software still needs costed recipes, accurate counts and someone acting on the variance each week. The discipline does the work; the tooling makes the discipline easier to keep. Without the routine behind it, a dashboard just reports the leak more precisely.

From Restaurant Food Cost Control: Theoretical vs Actual, and How to Close the Gap — the full reading, with the method behind this answer.