I'm not surprised you are bored with mostly salads. Even with yummy low or no glucose forming dressings - like avocado oil, hummus and apple cider vinegar is my current fave salad dressing. Salads can still just not do it for you if you aren't a vegetarian. And then, successful vegetarians and vegans usually eat those lovely meat-substitute foods for lasagnas and tofu delight types of things.
What's wrong with meat , poultry, and fish and seafood, and healthy fats? - dairy? if you can tolerate it. High meat sausages are pretty good for a low-carber, with no added sugar is best obviously, if you can find them. Or make your own sausage patties and know all the goodies that are in it, like meat, poultry, spices and herbs etc.
But not the oven baked wheat/grain bun - no. for sure. Much easier to avoid eating the bun if you have filled up on healthy fats from meats and veg and dairy.
Nothing wrong with onions! Re our blood sugars. Poor you having digestion probs with fruit! That's bad luck indeed.