That sucks. I thought the vegetarian option of a roast is a nut roast (correct me if I'm wrong). So what do you normally have?

Positive attitude! Sounds like the host was trying to go keto if no carbs/starches were found? I love homemade mac and cheese as well as my meat but this one...learned peanuts are not nuts

What you get for being vegetarian. With the current state of food, you do not get truly enough nutrients anyway. Go back to meat.

OP, I totally feel you! I've got a laundry list of food allergies (that have popped up or increased in severity over the years)... including tree/peanuts, veined or rhined cheeses (penicillium mold), lemongrass, shellfish, and more recently gluten (intolerance, not allergy), oh and garlic (intolerance hah). It's not as restrictive as it sounds, but when people trying to get 'fancy' with recipes, especially around the holidays, it's problematic. I try to eat beforehand if possible, but I (like you) am human, too. And sometimes don't think about it beforehand (b/c I'm so used to my diet that I sometimes brainlapse about people sneaking things into otherwise traditional dishes.. like almond slivers..). I always ask what's in something if I didn't see it being made. And do generally try to bring a few dishes that I know I can have. Idk what kind of bugs me more is when people go out to eat at places that I know I can't eat at- ie Red Lobster, or Thai/asian food places... (peanut oil in the air, and cross contamination).. I would never ask anyone to change their plans because of me. I'm used to it. But you know, on a human level, yeah it is kind of a bummer.

In my family, if you don't like what has been so carefully prepared for hours on end then you just go hungry. Its the holidays which are usually hectic so maybe they just forgot (or, if they weren't sure you were coming, may have been waiting to find out and then didn't have time.)

It's funny how people who eat meat almost always expect vegetarians and vegans to prepare lovely dinner parties with roasts and all, but they always seem to forget to return the favor :/

If you have specific food needs, it is wise to bring a dish you know you can eat.

Back when I was veg I used to bring my own personal meal just in case. If they had something I could eat, great, I'd have something left over later. Really solved a lot of issues like this. Good luck on the next one! Sometimes you have to make do when no one knows your allergies or forgets :/ better safe than hungry.

Then just eat meat..........we're omnivores not herbivores

There is no shame in bringing some food to a dinner party..as an allergic you have special needs, there's no shame in admitting to that, and even is quite nice of you to avoid the imposition of your hosts having to cook something special for you by bringing your own to warm up.