There are lots of low carb veggies – mushrooms, cauliflower, cabbage, broccoli, green beans, peppers, sugar snap peas, asparagus, radishes, celery, artichokes, onions, Brussels sprouts, tomatoes, …
There are lots of proteins – eggs, chicken, pork, beef, lamb, fish, seafood, …
There are lots of fats – olive oil, butter, avocado oil, heavy cream, coconut oil, mayo, cheese, …
There are lots of nuts and seeds – walnuts, pecans, macadamia, almonds, chia, pumpkin, sunflower, …
There are lots of spices – Salt, pepper, Italian seasoning, smoked paprika, onion powder, garlic powder, ginger, curry powder, …
There are all kinds of sauces and condiments – tomato sauce/paste, mustard, SF ketchup, SF BBQ sauce, salsa, guacamole, horseradish, SF jams/jellies, tartar sauce, …
There are lots of baking supplies – coconut flour, almond flour, flax meal, psyllium husk, Xanthan gum, extracts and SF syrups, unsweetened coconut or almond milks, artificial sweeteners, …
And so many I left out. Almost an infinite number of combinations.
But, in the end, you’ll have to check nutritional labels, because it’s carbs you’re trying to avoid. That’s mostly sugars and starches (breads, pastas, rices, potatoes, etc).
There are many low carb substitutes for the sugars and starches. For example, Egg Loaf is a great replacement for French toast.