What plant-based (non-dairy) milk do not separate when making caffe latte?
A good plant-based milk I've had success with is hemp milk. I'd say try coconut and almond milk, but these two are thinner in my experience, and tend to be less creamy. Hemp milk foams well, and is quite tasty. Like most things, don't get it too hot, or it'll break and be less desirable. That said, I never have problems in this regard with soy milk, but using non-soy is probably better for many other reasons.