I'm unable to answer your menu questions for you, I'm sure if you called the restaurant they would be happy to help you.
I'm vegetarian and eat there several times a week. They have wonderful veggie fajitas and will happily substitute black beans in tacos and enchiladas.
They are very accommodating to vegetarians as most of the menu items you can substitute beans for the meat. They also have spinache enchilada that I really like. Not sure about the lard and chicken stock.
Call them and ask.
Not sure how many options they have, but our family; whom 2 are vegetarian, frequent fajita night and they love their vegetarian fajitas and order the black beans instead of the refried beans with their meal. Just ask them for vegetarian options. They seem to be very accommodating.
Can't answer your concern
You can avoid the lard and select black beans instead of refries...make it cuban-mex!
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