This is kind of a fun little plant...Malabar spinach (Basella alba)
It's a nice substitute to spinach and lettuce in the summer, since those don't grow well is our hot climate. And it's a nice climber - although you might see in the pic that it's competing with the cucumbers right now. With the lack of water and mediocre sun exposure, it's taken awhile for this plant to do much - but I think it's going now.