Yummy sandwiches with nice bread and a choice of fillings. I like salami with avocado and red onion and pesto chicken with avocado and red onion. I also love toasted sandwiches, especially tuna melt.
Home made soups a big winner too. I love the fact that Eat have a choice of a Bold or a Simple soup every day.
Baked potatoes also good - you could also give a choice of baked sweet potatoes. Would consider doing sweet potato chips as kids tend to love these.
Good salads also a good idea - a nice potato salad, pasta salad, rice salad etc.
Omlettes and home-made quiche also very attractive on a menu. I have a fab local cafe that does a choice of two quiches plus various salads for £5.
Home-made cakes very important - you'll attract the maternity leave mums with those. We went miles for good cakes when I was on leave.
A good take-away service is also pretty important. Plus at my local cafe they sell good local produce to take away. I pop in there a lot on my way home from work.
Breakfast important too - good bacon sandwich, sausage sandwich (my cafe does this with a gorgrous onion relish), scrambled eggs with various toppings, french toast with bacon and maple syrup.
Sorry this is mammoth - hope it helps