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Discussion Starter · #1 ·
A friend of mine told me that Frisch's Big Boy now has a Portobello burger and I'm interested in trying it, but I am having trouble finding a list of ingredients anywhere. Does anyone here know if it is vegan? I know it's vegetarian, but I don't know what else they put on it.

Update: I found from their Facebook: "Chipotle mayonnaise compliments the meatless Portobello Burger - a marinated, fresh Portobello mushroom cap topped with sautéed onions and Swiss cheese. All three varieties are sandwiched on a brioche bun. Let us know what you think!"

Now I'd really like to know if the mayonnaise is vegan (which it probably isn't).
 
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