So really you're just cutting out most carbs, which sounds horrible but it's actually really easy to do, and if you want to stop it after the weight loss, just slowly re-introduce carbs back into your diet so you don't gain all that weight back really quickly. My mum has been doing keto for a year now and she looks great!
Breakfast options:
Smoked salmon, scrambled eggs with some lemon
Avocado, bacon with poached egg
Full english minus the bread or hashbrowns
Spinach omelette
Low carb fruits - strawberries, raspberries and blueberries (though limit these)
Lunch options:
Absolutely any meat or fish with salad
Omelettes
Meats/fish with roasted vegetables
Chicken ceaser salad with bacon, mmm
Dinner options:
Smoked gammon with low carb cauliflower cheese (one bag of parmesan mixed with one pot of double cream, layer over boiled cauliflower, cover with grated cheddar and put in the oven on high for 25 minutes, it's amazing).
Meat/fish with vegetables
Steak, asparagus, mushrooms and tomatoes and a side salad
Ham, eggs and mushrooms
Vegetable soups
Baked camembert with dippy carrots, cucumber and celery
Cheese board without bread
Puddings:
Limit them but if you really want something sweet try some strawberries with double cream. Don't go for low fat cream, go for the real thing. You can also get sugar free squirty cream!
Takeaways:
You can have duck pancakes from the chinese without the pancakes, and lots of the meat and veg dishes.
McDonalds: Double cheeseburgers without the bun, with a chicken and bacon salad (I used to eat this ALL the time)
Gourmet burger kitchen and Nando's have lots of options and sides.
Indian, you can get a full mixed grill with no carbs at all, and saag paneer.
Make sure you're only drinking water, sugar free squash or diet drinks.
I hope that helps!