npub14w37fjdpkezfacsz3q8r97yqs9e0cquntlfkamgdhewnpaud4x9qtu9vjx (npub14w3…9vjx) supposed to soak them and change the water a few times. I've seen some put in a net bag and placed in a stream. You have to crack the shells of course.
One family is sweeter than the other. I think white oak is the sweeter (compared to reds)