Most sandwiches don't have egg fillings, I think only one variant does. The rest is cheese with some spread (my favourite ones are pesto and the mysterious red thing).

Very short routes such as LON get crackers.

Morning flights from outstations get banana bread (if you plan to eat it, ask for at least two cups of water to get rid of the taste of sugar in your mouth afterwards), except the cracker routes.

Only flight I’ve been on what was solely water was on AMS - DUS (booked for 55mins, in reality shorter). But full drinks service usually available on AMS - MME (75 mins, in reality often shorter), except when Eastern Airlines are being incompetent and haven’t got beers. But both MME and NCL (80mins) vacillate between sandwich or mini cheddars (and sometimes those mini bocadito tomato and oregano things), seemingly without logic.

The service offered depends on the zone.
Destinations are grouped in zones and service rings; X short destinations are ; BRE/BRU/DUS/NWI in C class only a bag is offered ( no bar service except hot beverages if time permits)
in economy water bottle is offerd with a snack.
X short + destinations are FRA/HAJ/HAM/HUY/LCY/LHR/LUX in C class the meal box is offered with full bar service and hot beverages in economy water bottle and a snack.
Short service destinations are BER/BHX/BLL/CDG/LBA/MAN/NCL/SOU/STR C class meal box with full bar service and hot beverages in economy sweet snack till 11h29 and savoury snack rest of day with cold beverages, hot beverages if time permitting
All other destinations are either ,medium zone or Long in economy there is a sandwich and hot and cold drinks, on Long flights an extra round with coffee/tea/water etc will be offered with a cake/cookie
Bar is C class; water/San P/soda water/juices milk/Coca Cola and Zero Ginger Ale Tonic white wine /red wine/beer /various liquers and destilled drinks in economy similar but no hard drinks ( beer/wine is available though still at no charge) Flights with BOB testing will feature only free coffee/tea and water

Recall over 10 years ago I had some Rotterdam-LCY flights with full catering including wine (indeed, recall I asked for and got a 2nd glass). Fokker 50 though, that maybe added some minutes that made service possible. Forgot which airline (VLM?) but could credit to FB.