What’s a minor tweak you made to a basic recipe that instantly elevated it?

For me, it was adding just a splash of dark soy sauce and a touch of black vinegar to my stir-fry sauces right at the very end. Before that, my stir-fries always felt flat or a bit too salty without depth. The vinegar cuts through the richness and completely balances everything out.

What’s your favorite "small change, big difference" cooking secret? Would love to learn a few new tricks!