Connecting backyard drain to slab house

[jmccollum]

I would like to add a sink to my back yard barbeque area and am wondering how I go about connecting a drain from it to my existing plumbing at the house? I can easily get water out there but no way to drain?

My house was built in 1970 in Mission Viejo CA and I don't see a place to connect on the outside of the house.

Thanks,

Jack