I eat the lettuce, tomato, pickle and onion that comes with a burger. No ketchup but do eat mustard. But no bun.

As far as carbs the tomato and onion have some but are not really high carb foods and lettuce is pretty much no carb. Pickles as long as they are dill or sour pickles hardly any carbs. Cheese is another fairly low carb food but not zero carb.

I don't miss the bread any more.