It’s relatively easy to stay away from carbs. That part just takes willpower. Avoid sweets and breads!
Suggestion.
Breakfast: eggs & Bacon or ham, or a nice omelet. Avoid the toast & bagels
lunches: hamburger with no bun. Get them to lettuce wrap it if possible. And skip the fries.
dinners: steak or seafood and a steamed veggie.
The tricky part is getting enough fats. Since you are not making it, and adding fats while you cook, you have to add it afterwards. Eat butter, lots of butter! I will use a pat of butter with every bit of steak or eggs! I tell the waiter to bring me more butter than they have ever brought anyone before, and usually they need to bring me more after that.
orher good things you can add to meals aside from butter are sour cream and guacamole. Also cream cheese or regular cheese.
Eat an avocado!
or have a salad, but skip the normal dressing. Add bacon, ham, and eggs! Put a bunch of olive oil and red vinegar on it, it’s delicious.
It’s really not too hard, you just have to order things that you wouldn’t normally order.
also, be weary of sauces. And ask how things are prepared. That baked salmon from outback would be great, but that honey/bourbon glaze is a no-no. Just ask for no sauce.