The following is the e-mail response from Black Angus Steakhouse when asked which of their menu items are vegan:
You would need to ask for “no croutons” on the garden salad. It comes with Red cabbage, carrots, tomato wedge and croutons as standard. The broccoli is prepared with garlic butter so would need to ask for “no butter”. The green beans are prepared with olive oil, butter and bacon, so you would need to ask for “no butter and no bacon”.