I'm lucky as I'm home most lunchtimes, so I can cook what I like. My absolute favourite is a low fat sausage (1 syn), fried egg (half a syn), mushrooms & tinned tomatoes. If I haven't already had my HEB I'll have toast too.
I also like jacket potato with lashings of VLF cottage cheese & a squirt of Hellmans very light mayo (1 or 2 syns), with ham.
When I was working & doing SW I would take a salad every day, with chopped up apple & orange in it (love the sweet & savoury flavours toegther)