Separate knobs for hot and cold, like this: https://www.homedepot.com/p/MOEN-Brantford-4-in-Centerset-2-...

Getting ”Access Denied” from that link.

... or two separate taps even. Though it's quite a bit more exotic and ancient.

https://ichef.bbci.co.uk/news/1536/cpsprodpb/AF32/production...