I preprepare some food at home and also buy some food from our local cafe/deli.
Typically it's something like this:
wholemeal pitta with all sorts of different fillings, chicken, ham, tuna, eggs etc... with lots of green salad/spinach leaves etc...
Sometimes a power salad: rocket, spinach, roasted pine nuts, lardons, eggs, avocado, beetroot, olive oil. Sometimes I use tuna instead of some of the ingredients.
100-150g of unroasted & unsalted nut and raisins or oatcakes with cottage cheese
Large jacket potato, or pasta bake, with tuna, chicken or ham, beans etc...
Another wholemeal pitta with the aforementioned filling
The deli/cafe is great as they know I prefer less carbs in my servings and tend to be generous with fillings!
It's not a lot for lunch (only around 2-2.5k cals), but I have a large breakfast too, and a not excessively large but healthy 0 carb dinner (apart from veg which clearly has some carb value!) - end up being close to or around 3.5-4k cals a day.
Then the weekend I go mad!