I need a coder!!

I am a freelance graphic designer. I currently have a client in the restaurant business. For almost 10 years she has owned a restaurant/store that makes homemade meals to-go such as casseroles, dishes, cakes, etc. She currently only accepts in-store orders & payments but needs that to change. She would like an online ordering system exactly like the one below. It appears to be super simple compared to what I've seen. All the online systems I've found are more extensive with high monthly fees. [login to view URL] What she needs: 1) She has 4 menus (1 in-store & 3 seasonal). She needs the in-store active year around with the ability to toggle between the 3 seasonal menus. 2) Ability to make purchases online only during busy months (4mo out of year). I'm not sure what Cowgirl Kitchen uses, but recommendations are welcome. 3) Most importantly for what she does, she needs a way for the purchased items to be totaled so I'm guessing a backend is necessary to view items sold? During Thanksgiving & Christmas she has tons of orders for specific dishes and needs to be able to quickly view (at any time, whether it be daily or weekly) how many of each dish she needs to make. Please let me know if you have any questions.