While the vegetables are simmering, make the white sauce. Heat the oil in a medium saucepan. When it is hot add the flour and cook, stirring all the time, for 1 minute. Stir in the milk ...
The options expand even more when looking at the regional variety. At the time of writing, your local sub shop could carry any of the two following vegan-friendly sauces and spreads: barbecue sauce ...