Vegan replacement for egg wash?!
Answers:
soy milk, olive oil or vegan margarine all works to brown pastry.oil if you want a glaze.
former chef
If you are just doing to make your pastry look "pretty" then just leave it off. I actually think that egg-washed pastry looks terrible while plain pastry looks lovely.
If you need it to stick pastry together (or something to pastry) then use soy milk. You just need moisture and protein and soy milk has both.
If you are looking to glaze your recipe with a vegan egg substitute, simply replace the egg wash with oil or non dairy milk such as soya or rice milk. You can also use soya spread or corn syrup mixed with hot water.