Picture of the jade plant

Nothing, once burned thy won't turn back to green. If you leave it in the sun, new leaves will be fine.

Yep, I've learned this the hard way too. Once leaves are sunburned they never recover. Just have to wait for new ones. You can do some selective pruning or wait a while and then do it.

The real bummer is when you get sunburn on a plant with only a few really big leaves. Speaking from experience here. :)