What’s one ingredient that completely changed the way you cook?

I’m trying to step up my cooking game beyond just the usual salt-and-pepper routine. Recently, I added a splash of soy sauce to scrambled eggs (of all things) and it blew my mind. The depth, the umami, the balance it’s like I unlocked a cheat code for flavor. Now I’m wondering what your secret ingredient is. Something simple that makes everything better whether it’s a certain vinegar, spice blend, or that “grandma trick” you swear by. For me, I’ve learned it’s not about adding more, it’s about adding right. So what’s that one thing in your pantry or fridge that instantly elevates any dish?